Google chrome profile in use; browser does not start anymore

This is the problem when i click on google chrome:

The profile appears to be in use by process 2747 on host uber-c07b01. If you are sure no other processes are using this profile, delete the file /home/user/.config/google-chrome/SingletonLock and relaunch Google Chrome.

First open a terminal (dash->terminal) and type ...

ps -ef | grep 2747

This command shows processes that are currently running. Example:

ps -ef|grep 2747
rinzwind  2747  3327  0 06:51 ?        00:00:01 chromium-browser                          
rinzwind  6002  5950  0 14:31 pts/0    00:00:00 grep --color=auto 2747

The 1st resultline is what you are looking for. If this shows anything related to chrome you can then do ...

kill -9 2747

and try to restart chrome. The kill command kills process 2747. If that fails (ie. it the ps command shows nothing) do a ...

rm /home/$USER/.config/google-chrome/SingletonLock

This command actually removes a file so be careful when typing (so do a copy paste ;) ) and try to restart chrome.

If both fail you can also do a reboot before you try to open the browser.