Every time I login the CPU goes to 100%.

The processes that do this are:
sh -c { lsb release -is; } > 2>&1
sh -c { apt-cache policy 2>/dev/null; } 2>&1

Both of them are invoked from screenlet Sysmonitor.

It remains to 100% until I execute manual "sudo apt-get update" and then goes back to normal levels.