I can't find the Update Manager when I tried searching it on the Dash Home bar. Help please?
Righthand side, select the cog wheel. Choose system settings.
Besides the "updates available" in the drop down see also "software sources" (for settings on when there should be a check on updates).
The "updates available" will do what Osama Jaber posted for command line :)
Open Terminal and type the following
It will ask for the Password .Enter the password and update Manager will appear