ps -auxsudo killall -9 PID (process ID)
Originally posted by Fred:Check if it is running, if so, kill the process.Otherwise check for updates for your distribution, apply any updates, and then reboot your system.
Originally posted by rudeboyskunk Linux:I'm having the exact same problem with the exact same error message, but when I go to system monitor steam isn't listed as a running process, so there's nothing to kill. I'm afraid I might have to do a reinstall of Ubuntu, which I really don't want to do at all.btw I didn't change anything about my system and Steam has been running fine. I applied the update several days ago and it was running fine under that, but when I started my computer up this morning Steam wouldn't start and the terminal output gave me that message that the OP has.