Move away from LTS

centguy · 08-17-2022, 11:36 PM

I believe I have first installed ubuntu using 20.04 LTS. But
after so many times of apt update and apt upgrade, my kernel is now

Linux ubuntu40 5.15.0-43-generic #46~20.04.1-Ubuntu

So the question: Excessive apt upgrade will make the OS to jump from LTS to non-LTS?

evo2 · 08-18-2022, 12:00 AM

Quote:

Originally Posted by centguy

So the question: Excessive apt upgrade will make the OS to jump from LTS to non-LTS?

Not if you don't add non-LTS repos.

Evo2.

michaelk · 08-18-2022, 11:13 AM

No, an in place distribution upgrade should always be from one LTS version to another. I just updated my Ubuntu from 20.04 LTS to 22.04 LTS just because the automatic update process popped up a distribution upgrade window.

Just an apt update && apt upgrade will not update to a different version but you can manually upgrade using the do-release-upgrade command from a terminal.

centguy · 08-19-2022, 12:14 AM

Sorry, I don't quite get it.

From what I gather, if I login as root since day 1 after a LTS install, and do apt update and apt upgrade, I won't move away from LTS.
And as long as I do apt update and apt upgrade in the shell I won't leave LTS.

But if I entertain any updates from the pop ups from the Software & Updates Window or Software Updater then
I will jump from LTS to non-LTS.

If what I said is true above, then it means I have deviated from the LTS big time.

evo2 · 08-19-2022, 01:22 AM

Quote:

Originally Posted by centguy

From what I gather, if I login as root since day 1 after a LTS install, and do apt update and apt upgrade, I won't move away from LTS.
And as long as I do apt update and apt upgrade in the shell I won't leave LTS.

That should be true.

Quote:

Originally Posted by centguy

But if I entertain any updates from the pop ups from the Software & Updates Window or Software Updater then
I will jump from LTS to non-LTS.

Sorry I don't know what things are done behind the covers by random GUI programs.

Quote:

Originally Posted by centguy

If what I said is true above, then it means I have deviated from the LTS big time.

Is this purely hypothetical? If not, why not just check the state of your system?
Eg

Code:

lsb_release --all
cat /etc/os-release 
apt policy

Evo2.

centguy · 08-19-2022, 01:26 AM

$ lsb_release --all
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.4 LTS
Release: 20.04
Codename: focal

$ cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04.4 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.4 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

centguy · 08-19-2022, 01:31 AM

But distrowatch

Quote:

https://distrowatch.com/table.php?distribution=ubuntu

for row linux(5.19.2) says 5.4 under 20.04 LTS

and 5.15.0 under 22.04 jammy

But my uname -a

says

Linux ubuntu40 5.15.0-43-generic #46~20.04.1-Ubuntu

so I am thoroughly confused!

evo2 · 08-19-2022, 02:22 AM

Looks like 20.04 LTS with a backported kernel. Not unusual I'd think.

You can find out where that kernel (and any others on your system) came from with apt policy. Eg

Code:

apt policy $(dpkg -l |grep linux-image | awk '{ print $2 }')

And, as per my previous post you can see configured repos with

Code:

apt policy

Evo2.

centguy · 08-19-2022, 02:29 AM

So am I on LTS or am I on non-LTS?

Sorry I do not understand this backported thing.

Code:

$ apt policy $(dpkg -l |grep linux-image | awk '{ print $2 }')
linux-image-5.11.0-25-generic:
  Installed: (none)
  Candidate: 5.11.0-25.27~20.04.1
  Version table:
     5.11.0-25.27~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.11.0-27-generic:
  Installed: (none)
  Candidate: 5.11.0-27.29~20.04.1
  Version table:
     5.11.0-27.29~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.11.0-38-generic:
  Installed: (none)
  Candidate: 5.11.0-38.42~20.04.1
  Version table:
     5.11.0-38.42~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.11.0-40-generic:
  Installed: (none)
  Candidate: 5.11.0-40.44~20.04.2
  Version table:
     5.11.0-40.44~20.04.2 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.11.0-41-generic:
  Installed: (none)
  Candidate: 5.11.0-41.45~20.04.1
  Version table:
     5.11.0-41.45~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.11.0-43-generic:
  Installed: (none)
  Candidate: 5.11.0-43.47~20.04.2
  Version table:
     5.11.0-43.47~20.04.2 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.11.0-44-generic:
  Installed: (none)
  Candidate: 5.11.0-44.48~20.04.2
  Version table:
     5.11.0-44.48~20.04.2 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.11.0-46-generic:
  Installed: (none)
  Candidate: 5.11.0-46.51~20.04.1
  Version table:
     5.11.0-46.51~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-25-generic:
  Installed: (none)
  Candidate: 5.13.0-25.26~20.04.1
  Version table:
     5.13.0-25.26~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-27-generic:
  Installed: (none)
  Candidate: 5.13.0-27.29~20.04.1
  Version table:
     5.13.0-27.29~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-28-generic:
  Installed: (none)
  Candidate: 5.13.0-28.31~20.04.1
  Version table:
     5.13.0-28.31~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-30-generic:
  Installed: (none)
  Candidate: 5.13.0-30.33~20.04.1
  Version table:
     5.13.0-30.33~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-35-generic:
  Installed: (none)
  Candidate: 5.13.0-35.40~20.04.1
  Version table:
     5.13.0-35.40~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-37-generic:
  Installed: (none)
  Candidate: 5.13.0-37.42~20.04.1
  Version table:
     5.13.0-37.42~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-39-generic:
  Installed: (none)
  Candidate: 5.13.0-39.44~20.04.1
  Version table:
     5.13.0-39.44~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-40-generic:
  Installed: (none)
  Candidate: 5.13.0-40.45~20.04.1
  Version table:
     5.13.0-40.45~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-41-generic:
  Installed: (none)
  Candidate: 5.13.0-41.46~20.04.1
  Version table:
     5.13.0-41.46~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-44-generic:
  Installed: (none)
  Candidate: 5.13.0-44.49~20.04.1
  Version table:
     5.13.0-44.49~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-48-generic:
  Installed: (none)
  Candidate: 5.13.0-48.54~20.04.1
  Version table:
     5.13.0-48.54~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-51-generic:
  Installed: (none)
  Candidate: 5.13.0-51.58~20.04.1
  Version table:
     5.13.0-51.58~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.13.0-52-generic:
  Installed: (none)
  Candidate: 5.13.0-52.59~20.04.1
  Version table:
     5.13.0-52.59~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.15.0-41-generic:
  Installed: (none)
  Candidate: 5.15.0-41.44~20.04.1
  Version table:
     5.15.0-41.44~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.15.0-43-generic:
  Installed: 5.15.0-43.46~20.04.1
  Candidate: 5.15.0-43.46~20.04.1
  Version table:
 *** 5.15.0-43.46~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.15.0-46-generic:
  Installed: 5.15.0-46.49~20.04.1
  Candidate: 5.15.0-46.49~20.04.1
  Version table:
 *** 5.15.0-46.49~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.8.0-43-generic:
  Installed: (none)
  Candidate: 5.8.0-43.49~20.04.1
  Version table:
     5.8.0-43.49~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-5.8.0-50-generic:
  Installed: (none)
  Candidate: 5.8.0-50.56~20.04.1
  Version table:
     5.8.0-50.56~20.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
linux-image-generic-hwe-20.04:
  Installed: 5.15.0.46.49~20.04.16
  Candidate: 5.15.0.46.49~20.04.16
  Version table:
 *** 5.15.0.46.49~20.04.16 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     5.4.0.26.32 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

centguy · 08-19-2022, 02:39 AM

So it is still LTS but the kernel has been taken from the latest version? So I conclude that
by looking at the kernel number one cannot tell it is an older LTS system that has
been backported or a brand new OS. But this is a bad thing to do.

Quote:

https://www.redhat.com/en/blog/what-...d-hat-products

How backporting works

Now we are digging into more details, what did Red Hat do to make 31.el7 and how that is different than earlier versions of the bash-4.2.46 RPM package? What we are talking about now is backporting. Literally, we are taking code from a newer version upstream and integrating it back to an older version of the software. This is one of the great things about open source.

evo2 · 08-19-2022, 03:07 AM

Quote:

Originally Posted by centguy

So it is still LTS but the kernel has been taken from the latest version? So I conclude that
by looking at the kernel number one cannot tell it is an older LTS system that has
been backported or a brand new OS. But this is a bad thing to do.

The kernel is just one package, your system likely has thousands. Running a recent kernel provided by your distro is not a bad thing to do.

From you you posted you do indeed seem to be on 20.04 LTS with with security repos
correctly enabled which is where the 5.15 kernel comes from.

Not sure how relevant a Red Hat blog post is to your situation. You should be reading about Ubuntu LTS policies.

Evo2.