[SOLVED] Freeing Space

[wmeler]

Was having trouble freeing space, so wanted to post my solution for others having this issue in the future.

1) Though it's for ubuntu, linux mint is close, so check out:
https://itsfoss.com/free-up-space-ubuntu-linux/

2) Some helpful commands in this order:
sudo apt-get autoremove
sudo du -sh /var/cache/apt [just shows size of what will be autocleaned and cleaned below]
sudo apt-get autoclean
sudo apt-get clean
rm -rf ~/.cache/thumbnails/*

3) Ultimately, I had to re-size ("grow") a partition by using a Live USB (i.e. installation USB). In there, I had to use (and maybe install with synaptic) gparted. Then to use gparted, issue this command and maybe google more about resizing a partition if you're scared:
sudo gparted

Note that gparted will prompt you to be sure you want to "grow" the partition. I loved that word, because it was so clear.