LinuxQuestions.org

I leave notes here that I find particularly worth remembering myself.

Remove unwanted locales on Ubuntu / Debian

Please remember that this is not supported by the debian package manager and can break the system badly. I just read this while executing localpurge and stopped cold. The description said that the package manager would not know about it and strange effects could happen, the only way to fix it would be to have to reinstall all Debian packages that provide these locales. I'm really dependent on this server, it needs to run flawlessly, so I must look for another Debian compliant way, just wanted to post this here, to save people that time installing this in the first place. Filed under "don't break Debian"

Posted 10-21-2020 at 03:34 AM by browny_amiga browny_amiga is offline

USB stick with Ubuntu Live system doesn't boot - why?

Quote:

Originally Posted by drkitty

THANK YOU! THANK YOU1 I'd been beating my head against the monitor and trying *every* version of creating an Ubuntu boot usb drive. You were *absolutely* right that the "small print": needs to be set up as an installable drive is totally useless without some of idea of *how* one makes an installable drive. I followed your steps here and it worked like a charm.

Glad it helped!

Posted 11-21-2012 at 04:54 AM by bittner bittner is offline

USB stick with Ubuntu Live system doesn't boot - why?

Posted 11-20-2012 at 08:03 AM by drkitty drkitty is offline

USB stick with Ubuntu Live system doesn't boot - why?

Quote:

Originally Posted by grizlbr

I just formatted removable disk as fat32 boot from Ubuntu live. Reboot to physicaly remove thumb drive and return to 'Try' option before you insert disk into usb or slot to mount file system or ubuntu will ask to boot from serial drive2. From System Administration choose Create Boot Disk, format and set rw space to allow room for updates. First attempt gave disk full error.

Was that a question? Is there anything I can help you with? Have you tried step-by-step what I described above?

Posted 04-16-2012 at 07:21 AM by bittner bittner is offline

USB stick with Ubuntu Live system doesn't boot - why?

Posted 01-21-2011 at 02:39 PM by grizlbr grizlbr is offline

Shortest command to calculate the sum of a column of output

Calculate using Bash when bc is not installed

A much better alternative to bc than using a lengthy for loop is using Bash's calculation capability directly. Interestingly, I've figured out, there are two ways of assigning a value to a variable this way:

(( A=1+1 ))
A=$(( 1+1 ))

The spacing after and before the double-brackets is optional. The above calculation exercise would then read like this:

Code:

((SUM=$(dpkg-deb -c mypackage.deb | sed -e 's/.*root\s*//' -e 's/\s*2010-.*$//' | xargs | tr ' ' +)))

Code:

SUM=$(($(dpkg-deb -c mypackage.deb | sed -e 's/.*root\s*//' -e 's/\s*2010-.*$//' | xargs | tr ' ' +)))

Posted 08-25-2010 at 03:12 AM by bittner bittner is offline

Howto build your own Debian repository

"generate" silently fails sometimes (workaround)

Sometimes, for some reason I have not yet fully figured out apt-ftparchive generate puts old (probably cached) data into the Packages file. You only note this problem when, e.g., the .deb file size has changed and the old size doesn't match the new size anymore. In this special case apt-get will then complain:

Code:

E: Failed to fetch http://....
  Size mismatch

You can work around this issue using the packages command:

Code:

$ cd /home/bittner/Development/debian/mirror
$ apt-ftparchive -c personal-archive.conf packages \
  pool/personal/main > dists/personal/main/binary-i386/Packages
$ apt-ftparchive -c personal-archive.conf release \
  dists/personal > dists/personal/Release

Of course, if your mirror hosts several components and architectures you have to loop over all of them to generate separate Packages files.

Posted 08-06-2010 at 08:22 AM by bittner bittner is offline

Shortest command to calculate the sum of a column of output

Usually, bc should be installed on your Debian system. If you don't have it you could simply use a for loop that's built into bash:

Code:

SUM=0; for i in $(dpkg-deb -c mypackage.deb | sed -e 's/.*root\s*//' -e 's/\s*2010-.*$//' | xargs | tr ' ' +); do SUM=$(($SUM+$i)); done; echo $SUM

Or probably easier to read:

Code:

NUMBERS=$(dpkg-deb -c mypackage.deb | sed -e 's/.*root\s*//' -e 's/\s*2010-.*$//' | xargs | tr ' ' +)
SUM=0; for i in $NUMBERS; do SUM=$(($SUM + $i)); done
echo $SUM

You will notice that this takes a while, because the for loop is slow. Here, stripping out the 0-value lines may make sense...

Posted 06-02-2010 at 06:57 AM by bittner bittner is offline