The current partitioning as shown in Gnome Disks is:
/dev/sda1 Linux Bootable 500mb /dev/sda2 Linux LUKS Encryption 478gb (this is LVM) Free Space 21gb
In /dev/sda2, there is /, swap and /home.
I want to install another distribution on the 21gb free space. It will share swap and home partitions with the current installation.
I will mount /home and swap as respective mountpoints and not format them. I will create / for the new distribution.
The question is what do I do with /boot? Do I use the existing one or a new one?
Also, do I need to install GRUB again? Where?