There may be problems with the Fedora packages of Audacity. If you tried the 2.1.1 Fedora package, it is necessary to downgrade soundtouch in order to launch Audacity: http://forums.fedoraforum.org/showthread.php?t=308943.
When Audacity would not launch, did you see an error dialogue about Audacity not being able to find anywhere to write its Preferences? If so, follow that dialogue.
Your console errors look “normal”.
If it’s a Fedora packaging problem in 2.1.2 also, you can raise a bug report with Fedora or compile Audacity yourself. This topic may be useful to you: https://forum.audacityteam.org/t/fedora-23-audacity-2-1-2-crashes-on-startup/41796/1
Gale