Hi,
I have an old HP5310m laptop, it has a 120Gb HDD, which I partitioned to try out both Ubuntu Mate and Linux Mint.
I am happy with Mate, it does all I need it to do.
How can I remove the Linux Mint partition and free up 60Gb of HDD space?
pavlos_kairis is correct Sand319, partition management is best done from outside your MATE install using your live USB flash drive. Gparted is an excellent tool.
Make sure you know where your boot loader is, if you delete/shrink/move the wrong partition it could delete the boot manager. Which OS was installed first? Which OS occupies the first part of your disk?