My front-end freezes as soon as I type more than two letters in a notebook. I think the error occurs, when the auto-complete feature kicks in. If Mathematica was started from a terminal, the following text is shown.
Mathematica has received the signal: SIGSEGV and has exited. If possible, please report this problem to firstname.lastname@example.org describing in as much detail as possible what you were doing when the problem occurred.
I use Mathematica 10.3 on Ubuntu 12.04. Rebooting and
-cleanstart did not help. This installation worked fine for quite some time, but suddenly this problem appeared.
Is this a known problem? Before I contact the official support, I want to make sure that there is no trivial fix.