Recently I've installed Ubuntu 12.04 replacing Ubuntu 11.10, after installation, When I started my "Lenovo W520", I feel uncomfortable. It is too slow in booting process and also very slow in shutting down. Some operations are very slow.
The booting is so slow that, it's seems It is a Windows system instead of an Ubuntu.
Can anyone suggest, what actions I can take to investigate the issue and then to fix the problem? Re-installation advice should be last option.