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Removing a Linux Kernel in Manjaro (draft)

Date: 2017-05-27 09:04:41 +0000

Sources: Manjaro Kernels (Manjaro Wiki)

Identify Installed Kernels

If the existing Kernel being run in Manjaro is not immediately apparent (i.e. through the pre-installed Conky display on your desktop), then it can be shown by opening the terminal and then entering the following command:

$ mhwd-kernel -li
Currently running: 4.9.28-1-MANJARO (linux49)
The following kernels are installed in your system:
   * linux318
   * linux41
   * linux44
   * linux49

As seen in the above example, Manjaro is running kernel 4.9.28-1-MANJARO. Each part of the kernel name identifies something:

                  4.9.28-1-MANJARO
                  | |  | |   |
version ----------+ |  | |   |
major reversion ----+  | |   |
minor revision --------+ |   |
bug fix -----------------+   |
distribution ----------------+

Removing an Installed Kernel

Where multiple kernels are present on your system, pacman can be used to remove them in the terminal. It may be necessary to delete three elements of the kernel in total to completely remove it:

Element Command
1. The kernel itself sudo mhwd-kernel -r linux[version]
2. The kernel’s headers sudo pacman -R linux[version]-headers
3. The kernel’s extra modules sudo pacman -R linux[version]-extramodules

Whether or not the headers and extra modules must be deleted depends on whether or not they have been installed.

Warning: DO NOT attempt to delete an existing kernel while it is actually being used by Manjaro at the time. You can first identify what kernel is running on your system by using the command mhwd-kernel -li in the terminal (see above).

$ sudo mhwd-kernel -r linux318
[sudo] password for spherehead: 
checking dependencies...

Packages (4) linux318-3.18.53-1 \
             linux318-bbswitch-0.8-31 \
             linux318-ndiswrapper-1.61-7 \
             linux318-nvidia-1:375.66-2

Total Removed Size:  81.39 MiB

:: Do you want to remove these packages? [Y/n] y
:: Processing package changes...
(1/4) removing linux318-nvidia                                              [##########] 100%
(2/4) removing linux318-ndiswrapper                                         [##########] 100%
(3/4) removing linux318-bbswitch                                            [##########] 100%
(4/4) removing linux318                                                     [##########] 100%
:: Running post-transaction hooks...
(1/2) Updating Grub-Bootmenu
Generating grub configuration file ...
Found background: /usr/share/grub/background.png
Found Intel Microcode image
Found linux image: /boot/vmlinuz-4.9-x86_64
Found initrd image: /boot/initramfs-4.9-x86_64.img
Found initrd fallback image: /boot/initramfs-4.9-x86_64-fallback.img
Found linux image: /boot/vmlinuz-4.4-x86_64
Found initrd image: /boot/initramfs-4.4-x86_64.img
Found initrd fallback image: /boot/initramfs-4.4-x86_64-fallback.img
Found linux image: /boot/vmlinuz-4.1-x86_64
Found initrd image: /boot/initramfs-4.1-x86_64.img
Found initrd fallback image: /boot/initramfs-4.1-x86_64-fallback.img
Found Manjaro Linux (15.12) on /dev/sda3
Found memtest86+ image: /boot/memtest86+/memtest.bin
done
(2/2) Arming ConditionNeedsUpdate...

To remove kernel headers:

$ sudo pacman -R linux318-headers
error: target not found: linux318-headers

To remove kernel modules:

$ sudo pacman -R linux318-extramodules
error: target not found: linux318-extramodules

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  •  kernel