Way to delete old kernel and release disk space in /boot
Case: /boot partition is 100% used and apt malfunctions
When I tired to install nginx in Ubuntu 14.04 server, I noticed that whatever package I install by using apt install, error massage like this emerges.
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The following packages have unmet dependencies:
linux-image-generic :
Depends: linux-image-4.4.0-150-generic but it is not installed or
linux-image-unsigned-4.4.0-150-generic but it is not installed
Recommends: thermald but it is not installed
linux-modules-extra-4.4.0-150-generic :
Depends: linux-image-4.4.0-150-generic but it is not installed or
linux-image-unsigned-4.4.0-150-generic but it is not installed
Also, I’ve attempted to update the Linux kernel by using the script provided by teddysun, but failed.
I also tried installing nginx by using the command apt -f install nginx, it turned out to be the same output as above. And apt autoremove does not take effect.
Solution to this problem
Detect if /boot partition is fully occupied
Run df -lh
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root@localhost:~# df -lh
Filesystem Size Used Avail Use% Mounted on
udev 217M 0 217M 0% /dev
tmpfs 50M 9.7M 40M 20% /run
/dev/sda2 9.5G 3.3G 5.7G 37% /
tmpfs 247M 0 247M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 247M 0 247M 0% /sys/fs/cgroup
/dev/sda1 361M 361M 0M 100% /boot
tmpfs 50M 0 50M 0% /run/user/0
It seems that the /boot partition is full. So that new kernel cannot be installed.
List all the kernels
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sudo dpkg --list 'linux-image*'|awk '{ if ($1=="ii") print $2}'|grep -v `uname -r`
The output may be something like below
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linux-image-3.19.0-25-generic
linux-image-3.19.0-56-generic
linux-image-3.19.0-58-generic
linux-image-3.19.0-59-generic
linux-image-3.19.0-61-generic
linux-image-3.19.0-65-generic
linux-image-extra-3.19.0-25-generic
linux-image-extra-3.19.0-56-generic
linux-image-extra-3.19.0-58-generic
linux-image-extra-3.19.0-59-generic
linux-image-extra-3.19.0-61-generic
Force remove old kernels
Use dpkg -P --force-depends to force remove the kernel file. apt purge did not work for me.
For example:
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sudo dpkg -P --force-depends linux-image-4.4.0-134-generic
