Ive installed p99 on Mint Cinammon and had no issues at all. Theres a few guides around, heres a couple of them:
https://www.project1999.com/forums/s...d.php?t=212710
https://wiki.project1999.com/EverQuest_in_Linux_Guide
One thing to take note Linux is case sensitive with files and everytime you patch you need to rename dsetup.dll to DSETUP.dll