I'm using blender 2.79 in two different Linux computers (Redhat and Arch, both running Gnome 3), and I'm hitting a super annoying issue.
Whenever I try to use any shortcut with Ctrl, it behaves as if I had hit Ctrl and Alt, instead, and any further key hits behave as if Alt was pressed.
For example, if I try to hit Ctrl+P for parenting objects, it instead shows an error complaining about proxies (it got Ctrl+Alt+P- Make Proxy).
After that, if I hit p, it opens the Clear Parent; if I then hit space, it shows the Orientation menu, instead of the tool search. I can't even move the view by dragging with the MMB (in the same way I couldn't do it with Alt+MMB.
That behavior continues until I hit Alt, and the shortcuts start to work again (unless, of course, they have Ctrl in them).
I'm new to Blender, so this may be a noob question, but I just can't find any answers to it, and I'm surprise I face it on two different systems.