Tag Archives: upgrade

Ubuntu house keeping

Ubuntu logo ubuntu.comI am running a small Ubuntu server that I have just given 8GB of virtual HD space. I thought that would be enough. However, as I was trying to transfer some data to it I ran out of space. This left me wondering what happened.

I went to search where the data was stored and it was in /var/cache/apt. It contained 560MB. This is what I did to clean it.

# sudo apt-get autoclean
Reading package lists... Done
Building dependency tree
Reading state information... Done
Del libapt-inst1.4 0.8.16~exp12ubuntu10.5 [99.8 kB]
Del linux-image-server 3.2.0.33.36 [2,652 B]
Del linux-headers-virtual 3.2.0.33.36 [2,642 B]
Del perl 5.14.2-6ubuntu2.1 [4,416 kB]
Del libapt-pkg4.12 0.8.16~exp12ubuntu10.5 [939 kB]
Del perl-modules 5.14.2-6ubuntu2.1 [3,396 kB]
Del firefox-locale-en 17.0+build2-0ubuntu0.12.04.1 [482 kB]
Del perl-base 5.14.2-6ubuntu2.1 [1,498 kB]
Del apt 0.8.16~exp12ubuntu10.5 [1,100 kB]
Del linux-libc-dev 3.2.0-33.52 [867 kB]
Del linux-headers-server 3.2.0.33.36 [2,648 B]
Del apt-utils 0.8.16~exp12ubuntu10.5 [190 kB]
Del coreutils 8.13-3ubuntu3.1 [2,216 kB]
Del apt-transport-https 0.8.16~exp12ubuntu10.5 [16.3 kB]
Del linux-server 3.2.0.33.36 [1,728 B]
Del firefox-locale-en 16.0.2+build1-0ubuntu0.12.04.1 [481 kB]

Cache reduced a little bit to 545MB, clearly that was not what I was looking for. Time to wipe out the cache!

sudo apt-get clean

Almost enough space now, but not quite. What else was taking up space. The /usr/src contained 1.2GB of linux headers of all previous kernels that were installed.
Then I came across this post by Ubuntu Genius where he gave this nice one line command:

dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge

or interactive:

sudo apt-get remove --purge $(dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d')

Just make sure you have rebooted since your last kernel upgrade!

This cleared another 2.5GB!!!!

Mount error (12) after upgrade to Ubuntu 12.04

I recently upgrade an Ubuntu server from 10.04 to 12.04 and I encountered this error when trying to mount a cifs folder on a Windows 7 machine.

mount error(12): Cannot allocate memory
Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)

I suspected it was related to the recent upgrade but it turns out that the error was caused by the Windows 7 system. I only mount this folder on rare occasions when I want to back up some folders to this system. Therefore I can not be sure if the problem was caused by my recent server update or some recent Windows 7 updates.

I found the solution in this post and some more details here:

These registery items need to be changed to make Windows 7 act more as a file server and prevent the error:

  • HKLMSYSTEMCurrentControlSetControlSession ManagerMemory ManagementLargeSystemCache change to 1
  • HKLMSYSTEMCurrentControlSetServicesLanmanServerParametersSize change to 3

Ubuntu mirror problems

Ubuntu logo ubuntu.comWhen I started what I thought would be a simple update of a few of my Ubuntu server virtual machines I didn’t know how much trouble the mirrors would give me.
For a start, the sg. mirror failed to load completely. Then I found some info about ec2 mirrors, but they gave me Hash Sum mismatch problems.
Then I came across the mirror:// schema, that worked great and I managed to upgrade one system. Funny enough, I would expected the upgrade from 10.04 to result in a 12.04 but I ended up with 11.10?? Not so sure if I started with a different version or the failed update and upgrades caused this.

Now my problems really started. Trying to upgrade from 11.10 Oneric to 12.04 Precise seemed impossible. If I would use the mirror://mirrors.ubuntu.com/mirrors.txt the mirrors would fail and no package information was downloaded. Next, using the ec2 it wouldn’t even try to download as the Hash would fail.

In the end I logged into a Ubuntu server I manage in the Netherlands and download the http://mirrors.ubuntu.com/mirrors.txt. This is the list I downloaded from the Netherlands:

http://ftp.telfort.nl/pub/mirror/ubuntu/
http://ubuntu.mirror.cambrium.nl/ubuntu/
http://ftp.snt.utwente.nl/pub/os/linux/ubuntu/
http://nl3.archive.ubuntu.com/ubuntu/
http://nl.archive.ubuntu.com/ubuntu/
http://ubuntu.mirror.atratoip.net/ubuntu/
http://ubuntu.tiscali.nl/
http://osmirror.rug.nl/ubuntu/
http://mirror.nl.leaseweb.net/ubuntu/
http://mirror.i3d.net/pub/ubuntu/
http://ftp.tudelft.nl/archive.ubuntu.com/
http://mirrors.nl.eu.kernel.org/ubuntu/

Compared to the one from Singapore:

http://linux.ntuoss.org/ubuntu/
http://mirror.nus.edu.sg/ubuntu/
http://download.nus.edu.sg/mirror/ubuntu/
http://ubuntu.oss.eznetsols.org/ubuntu/
http://archive.ubuntu.com/ubuntu/

The tudelft seemed the most reliable source and when I replaced my mirrors with this one I managed to finally upgrade the server to 12.04.

So much for Ubuntu being the most user friendly Linux distro around. And shame on the mirrors in Singapore for being of such poor standard.