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-   -   2nd OS not listed in Grub2 menu after Fedora install (https://www.linuxquestions.org/questions/fedora-35/2nd-os-not-listed-in-grub2-menu-after-fedora-install-4175640603/)

hrsetrdr 10-17-2018 06:43 PM
2nd OS not listed in Grub2 menu after Fedora install
 
2nd OS not listed in Grub2 menu after Fedora install


Haven't had this happen in years. Install Fedora and all well except CentOS 7 is not listed in Grub menu. I thought that
Code:
os-prober
, then
Code:
grub2-mkconfig -o /boot/grub2/grub.cfg
would fix the issue, but upon reboot CentOS is still not listed.

Running "fdisk -l" :

Code:
Device    Boot    Start      End  Sectors  Size Id Type
/dev/sda1  *        2048 136796159 136794112 65.2G 83 Linux
/dev/sda2      136798206 156327935  19529730  9.3G  5 Extended
/dev/sda3      156327936 293046271 136718336 65.2G 83 Linux
/dev/sda5      136798208 156327935  19529728  9.3G 82 Linux swap / Solaris
...shows Centos 7 at /dev/sda3. Dumb question: should /dev/sda3 be flagged "bootable"?

syg00 10-17-2018 07:02 PM
Did it show up in the os-prober run ?.
Grub ignores the boot flag - that is merely a hangover from MS-DOS that M$oft, and some BIOS writers, still think is needed.

Bolding your entire post is pointless.

frankbell 10-17-2018 07:07 PM
Quote:
Dumb question: should /dev/sda3 be flagged "bootable"
That should not be necessary.

I'd suggest trying an update-grub. http://manpages.ubuntu.com/manpages/...te-grub.8.html

hrsetrdr 10-17-2018 07:08 PM
Quote:
Originally Posted by syg00 (Post 5916072)
Did it show up in the os-prober run ?.
No, only shows:

Code:
/dev/sda3:Fedora 28 (Twenty Eight):Fedora:linux

Quote:
Originally Posted by syg00 (Post 5916072)
Bolding your entire post is pointless.
Sorry if the bolding bothers you, not sure why.

syg00 10-17-2018 07:37 PM
os-prober is just a script, and looks for "known" patterns for kernel names. I would be surprised if CentOS didn't conform.

John VV 10-17-2018 07:57 PM
in the past on fedora i found that forcing a kernel update solves this issue
-- the needed scripts are then ran

Code:
dnf -f update kernel*


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