Let me start by saying how much and good work has been put into CodeXL 1.7 for Linux. Very polished product.
A minor issue is that the Quick Launch icon in the unity panel in Ubuntu 14.04 x64, doesn't work. I press it and nothing happens.
This is a bit more important than in windows. If I launch from a terminal, that terminal gets waisted from all CodeXL messages.
And PC real estate property is very much at a premium in LInux :-(