ERROR:process_singleton_linux.cc(443)] readlink failed: Input/output error
Solution
http://ubuntuforums.org/showthread.php?t=1623261
The trick is to remove (or just move, just in case) the ~/.config/chromium folder and let it recreate itself when chromium-browser starts
also maybe:
sudo chown -R username:usergroup -R ~/.config/chromium
