Entries should be removed by editing or removing files in the /etc/grub.d folder. The /boot/grub/grub.cfg file is read-only and should not normally require editing.
Too Many Kernels? Kernels removed via Synaptic or with "apt-get remove" will automatically update grub.cfg and no user action is required.
* To find current kernel, in a terminal type: uname -r
* In Synaptic, type linux-image-2 in the search window at the upper right;
* The results should show every available and installed kernel. A green box on the left indicates that the package is installed. The only linux-image you want installed is the latest one. Uninstall the old kernels from the list by clicking their boxes and selecting "Mark for Removal".
* or Right click and select "Mark for Complete Removal" and then press the Apply main menu button;
The kernels will be removed from your system and from the Grub menu. Note -many users keep one previous kernel on the machine which previously ran without problems.
If you don't want to see the "Memtest86+" entries, run this command:
Code: sudo chmod -x /etc/grub.d/20_memtest86+
Run the update-grub command to allow the changes to be incorporated in grub.cfg
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