@Mark81 said: SIGILL That is an illegal instruction signal, which is pretty rare. Basically means the memory your program's residing in got corrupted somehow. So there's something very wrong. Check any callbacks, overwriting by mistake virtual tables and the such.

@okieh As it looks to me the installation of Qt 5.2.1 is broken. If possible you should also install the newest version of Qt libs IMHO. However, from personal experience it might be also worthwhile to update your Ubuntu. I am operating a server with Ubuntu 12.04 and had quite a bit of trouble in connection Qt 5 there. Luckily the admin there, "some" version (5.0 or 5.1) to work at least moderately. On Ubuntu 14.04 on my desktop everything worked like a charm. Finally I like to state that I am developing on Windows. Therefore, my Linux knowledge is limited as well.