How to uninstall the old kernel by Linux
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First of all, you can see which kernel is currently in use, and you can get the information through the command: uname-a. For example, on my desktop, it reads:
Magc@magc-desktop:~$ uname-a
Linux magc-desktop 2.6.24-19-rt # 1 SMP PREEMPT RT Thu Aug 21 02:08:03 UTC 2008 i686 GNU/Linux
Then look at the list of all the kernels on the machine to decide which ones need to be deleted:
Run the command: dpkg-get-selections | grep linux, for example, my local display is as follows:
Magc@magc-desktop:~$ dpkg-get-selections | grep linux
Libselinux1 install
Linux-generic install
Linux-headers-2.6.24-19 install
Linux-headers-2.6.24-19-generic install
Linux-headers-2.6.24-19-rt install
Linux-headers-2.6.24-21 install
Linux-headers-2.6.24-21-generic install
Linux-headers-2.6.24-21-rt install
Linux-headers-generic install
Linux-headers-rt install
Linux-image-2.6.24-19-generic deinstall
Linux-image-2.6.24-19-rt install
Linux-image-2.6.24-21-generic install
Linux-image-generic install
Linux-image-rt install
Linux-restricted-modules-2.6.24-19-generic deinstall
Linux-restricted-modules-2.6.24-19-rt install
Linux-restricted-modules-2.6.24-21-generic install
Linux-restricted-modules-common install
Linux-restricted-modules-generic install
Linux-restricted-modules-rt install
Linux-rt install
Linux-sound-base install
Linux-ubuntu-modules-2.6.24-19-generic deinstall
Linux-ubuntu-modules-2.6.24-19-rt install
Linux-ubuntu-modules-2.6.24-21-generic install
Util-linux install
Util-linux-locales install
The one with image is the kernel file, so you can see that there are five kernel versions on my machine. I am currently using 2.6.24-19-rt, so I decided to delete other useless kernels.
The command to delete is: sudo apt-get remove linux-image-XXXX
For example, the way to delete the linux-image-2.6.24-19-generic kernel is:
Sudo apt-get remove linux-image-2.6.24-19-generic
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