When trying to run do-release-upgrade, the process stops with …
Not enough free disk space
The upgrade has aborted. The upgrade needs a total of 55.8 M free
space on disk ‘/boot’. Please free at least an additional 47.5 M of
disk space on ‘/boot’. Empty your trash and remove temporary packages
of former installations using ‘sudo apt-get clean’.
A quick df will show that the /boot partition is indeed nearly full.
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/glw–oee–serv–vg-root 100750768 3442692 92183572 4% /
udev 1012076 4 1012072 1% /dev
tmpfs 204388 264 204124 1% /run
none 5120 0 5120 0% /run/lock
none 1021920 0 1021920 0% /run/shm
/dev/sda1 233191 212670 8080 97% /boot
The main reason is that the /boot partition is filled with old kernels. First check uname -a to check your current version as we are going to clean-up some of the old packages. The run the following command to get a list of install kernel packages.
[codesyntax lang=”bash”]
dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d'
[/codesyntax]
The output will look something like this:
server:~$ dpkg -l ‘linux-*’ | sed ‘/^ii/!d;/'”$(uname -r | sed “s/\(.*\)-\([^0-9]\+\)/\1/”)”‘/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d’
linux-headers-3.8.0-29
linux-headers-3.8.0-29-generic
linux-headers-3.8.0-30
linux-headers-3.8.0-30-generic
linux-headers-3.8.0-32
linux-headers-3.8.0-32-generic
linux-headers-3.8.0-33
linux-headers-3.8.0-33-generic
linux-headers-3.8.0-34
linux-headers-3.8.0-34-generic
linux-headers-3.8.0-35
linux-headers-3.8.0-35-generic
linux-headers-3.8.0-37
linux-headers-3.8.0-37-generic
linux-image-3.8.0-29-generic
linux-image-3.8.0-30-generic
linux-image-3.8.0-32-generic
linux-image-3.8.0-33-generic
linux-image-3.8.0-34-generic
linux-image-3.8.0-35-generic
Now use the following command to clean-up up some of those packages and free up space on /boot.
sudo apt-get -y purge some-kernel-package
Example: sudo apt-get -y purge linux-image-3.8.0-29-generic