I did a complete reinstall today of Ubuntu 16.04 (my SSD was encrypted, which prevented me from resizing the partition. This got old, and I didn't feel like going through the command line mess to get rid of it and possibly messing up). I have another Linux distro that I've been using via Live Persistent USB, but it's simply too slow, so I want to put it on my hard drive.
Here are my partitions:
I obviously can't unmount sda2 while it's running, so how do I go about doing this?