Don't use the installer.
Though it's our latest "release" version, it's over a year old, and lots of Gmod updates broke various things that we've long since updated
Get the latest code from our Github repo (can get the always latest zip from
https://github.com/Nayruden/Ulysses/archive/master.zip ... only _need_ the ulib and ulx folders from within).
Delete the old folders first before unzipping new.
As for DarkRP, there's too many other posts regarding it breaking ulib groups. Just search our help forum section for DarkRP and you'll see.
It overrites ours. Disable Fadmin (a DarkRP admin mod that comes with it and conflicts with ULX)
After that, see the 2-3 FAQs in our FAQ section dealing with trouble with access.
One of them asks for specific information to give to us that ulx creates after a special command is run.