Hello! I have a /home partition that is almost full, and there is another partition nearby with a lot of free space. I would like to reduce the size of this neighboring partition and add the freed space to /home. I would like to do this safely, without using a Live USB or bootable flash drive. Is this possible?
Safely is always a bit iffy when you’re resizing partitions with data on them. Parted and various GUI tools built on top of it can resize partitions without losing data in most cases, but there is always a risk. I wouldn’t like doing this without fresh backups.
You can unmount the home partition for resizing when you’re not using it, e.g. if you log in as root, which typically has its home directory in /root. This would allow resizing it while running from your installed OS rather than a flash drive.
You don’t need to unmount anything to resize.