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Not enough free Disk Space on /boot

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Recently I tried to install updates with “apt-get upgrade” on a Ubuntu Desktop 20.04 LTS. The installation of the updates failed because of to less free space on the boot partition.

I got the following error message:

Not enough free disk space

The upgrade has aborted. The upgrade needs a total of 25.7 M free space on disk '/boot'. Please free at least an additional 25.7 M of disk space on '/boot'. Empty your trash and remove temporary packages of former installations using 'sudo apt-get clean'.

The aim for me was just to free up some space on /boot so that I could install the newest kernel version.

So I just executed this command in the Linux terminal:

root@ubuntubox:/# dpkg -l |grep linux-image |grep -v extra

A lot of obsolete kernel versions where shown.

The next step for me was to remove one or more obsolete kernels:

root@ubuntubox:/boot# apt-get remove linux-image-4.15.0-169-generic
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
Suggested packages:
  fdutils linux-doc-4.15.0 | linux-source-4.15.0 linux-tools
The following packages will be REMOVED:
  linux-image-4.15.0-169-generic linux-modules-extra-4.15.0-169-generic
The following NEW packages will be installed:
0 upgraded, 1 newly installed, 2 to remove and 4 not upgraded.
Need to get 8.119 kB of archives.
After this operation, 181 MB disk space will be freed.
Do you want to continue? [Y/n] Y

I did this for several OLD kernels then there was enough free space on /boot again.

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