Resizing and moving an encrypted LVM volume

I use a LUKS-encrypted LVM setup for my laptop. Within the encrypted volume I have partitions for / and /home and I guessed the sizes wrong, so I needed to change them.

I did various reading, and even resized some filesystems and partitions, before I discovered the answer that made it all very easy for me.

Reboot into an Ubuntu live USB, do

sudo apt install partitionmanager

and then start KDE Partition Manager from the menu.

I was able to resize and move partitions within my encrypted volume, and resizing filesystems was handled automatically for me. It even handled the fact that my / partition was before the /home so there wasn't room to expand it. I think it moved it to the end, or maybe it doesn't actually work the way I think it does.

Everything worked flawlessly and I am typing this on the machine which successfully booted after the changes, and shows the correctly-resized partitions.