i installed wrt (your package ) from app manager then after installation i got in the log file some error and try to apt-get install -f so i said ok and after that command i got errors sorry i dont have it now to put it here and then the error in xterminal about faild to overwrite some files about qtwrt i think and i didnt know what should i remove and get confused so i tried to remove what i installed and i got the same error again at the end i restored my backup and all fine now