Palladiniu [palladaini@storm-os-01 ~]$
brent What's an XFCE terminal?
XFCE is a fairly lightweight DE that I've used on several other distros. It provides its own terminal emulator, as do other DEs. I have no idea why anyone would want to install it on Solus, except maybe out of curiosity. As far as I know, it should work, but so does the terminal that Solus already provides.
Another possibility is that he wasn't running on Solus at the time these commands failed. It would be natural for another distro to complain that it doesn't know about eopkg
if that were the case.