How-to Pause a Linux Process

1. Run ps or ps aux to find the PID of the process you want to stop.
2.  kill -STOP 7727 but replace the number with your own process PID
3. To continue execution of xeyes, run kill -CONT 7727, again with your own PID

Ubuntu One fails to launch from a terminal

If Ubuntu One fails to launch from a terminal chances are it will not auto launch in start up either. To fix this:

Open Applications->Accessories->Terminal and run:
  u1sdtool -q; killall ubuntuone-login ubuntuone-preferences;
  sudo rm -rf ~/.local/share/ubuntuone
  rm -rf ~/.cache/ubuntuone
  rm -rf ~/.config/ubuntuone
  mv ~/Ubuntu\ One/ ~/Ubuntu\ One_old/
Open Applications->Accessories->Passwords and Encryption Keys, go to the Passwords tab, delete the Ubuntu One and Desktopcouch tokens by right-clicking on them and selecting "Delete"
Back in a terminal session, run:
  u1sdtool -q; killall ubuntuone-login; u1sdtool -c 

 http://askubuntu.com/questions/39518/ubuntu-one-fails-to-launch-from-a-terminal

sudo cannot resolve the local hostname

If you get:

sudo cannot resolve the local hostname

Just go to terminal and type:

sudo nano /etc/host

Ensure that the following lines exist

127.0.0.1       localhost
127.0.1.1       replace this with your laptop/computer name

Hopefully this will remove your problem.

source:
 https://bugs.launchpad.net/ubuntu/+source/sudo/+bug/32906