Code:
sda 931.5G
├─sda1 vfat 1G /boot/efi
├─sda2 ext4 2G /boot
└─sda3 928.5G
└─ubuntu--vg-ubuntu--lv ext4 100G /
tells me that you are using LVM. This is a very good thing from a flexibility standpoint, but not exactly noob-friendly.
Some thoughts. I'm going to guess the commands and I'll be close, but may not be exact. Read the man pages if it doesn't work.
a. 100G for / is huge. Much better to reduce that to 35G as step 1.
b. Created a swap logical volume. If this is a desktop, make it 4.1GB in size.
Code:
sudo lvcreate -L 4.1G -n swap vg-ubuntu
sudo mkswap /dev/vg-ubuntu/swap
sudoedit /etc/fstab # add the new swap LV there (/dev/vg-ubuntu/swap) and remove the swapfile that exists, if it does exist.
c. Create a logical volume for the /home area and move all the files from the current /home into it.
Code:
sudo lvcreate -L 20G -n home vg-ubuntu # Check the size currently used, but 20G should be enough for 1 user.
sudo mkfs -t ext4 /dev/vg-ubuntu/home # format the LV with ext4
sudoedit /etc/fstab # add the new home LV there (/dev/vg-ubuntu/home)
d. Create a temporary mount point, mount the new storage and copy over everything in the old /home/ to the new home
Code:
sudo mkdir /mnt/home-new
sudo mount /dev/vg-ubuntu/home /mnt/home-new
sudo rsync -avz /home/ /mnt/home-new/ # if there are errors,
That should be enough for files in /home, provided you don't put media files there or other wasted crap there. At reboot, this mount will move the /home, assuming you've correctly setup the fstab.
e. You might want to create an LV for /var/. That's your decision. If you use lots of snap packages, this will need to be larger than expected. If you place virtual machines here, it might need to be 200GB+.
f. You might want to create an LV for /media/data/. That's your decision. This would be where media files should go and perhaps lots of other junk.
g. After you copy over ll the files to the new /home/ that will leave the old files buried, hidden, underneath, inaccessible. To remove them, you'll need to boot from a USB Flash drive, manually mount the old root, find the old home directory, and delete everything that isn't needed any more. Be careful.
h. Also, if it were me, I'd reduce the current "root" logical volume from 100G to 35G, just to clean up the junk. lvreduce is the command. It will need to be run from a USB flash drive boot, since reducing an actively used file system is a bit dangerous. Be certain to use the option that includes resizing the file system in the lvreduce and lvextend commands is used. Otherwise, you'll need to remember to run that file system reduce/extend commands separately.
I've posted my LVM layouts in these forums a few times over the last decade.
Expanding a logical volume that uses ext4 is 5 seconds. During the operation, the file system can be busy, active, mounted. It is 1 command. If you work through an LVM2 tutorial, the good news is that LVM is LVM is LVM, regardless of Linux distro. Find a tutorial that makes sense to you - Ubuntu, RHEL, SuSE, Debian, whatever. The commands are the same. The ideas are the same. Don't expect to use a GUI, ever. Most GUI tools for LVM are dead projects.
