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I have Windows 10 as primary OS installed and 2 Linux versions. The boot menu is set by GRUB and Windows 10 is the first option for boot.
May someone suggest me how would be a safe way to delete/uninstall one of the Linux versions and after that have the boot menu showing the only 2 remaining OS?
Thanks in advance
Exact process will depend on which Linux install wrote the bootloader, and what that install sees as /.
Win10, LinuxA, LinuxB, assume you are keeping LinuxA and it is LinuxA's GRUB that is "in charge" at the moment.
Boot LinuxA, ensure that nothing from LinuxB is mounted, and use fdisk, gparted, etc. to simply delete the partition(s) for LinuxB. Once they are deleted, make the bootloader (GRUB) aware of the changes by running update-grub
Where it gets tricky is if you want to keep LinuxB but LinuxA has the boot loader or vice versa.
In that case, you need to boot the Linux you are keeping, get GRUB set up and configured, and install GRUB to the MBR. Then reboot, go back into that Linux install, and remove the other Linux install. Run the update-grub and you should be good to go.
get GRUB set up and configured, and install GRUB to the MBR or if you have chance explain me inn more detail please. Thanks again