Hello,
Having trouble locating System Monitor in Trisquel 5.5/6.0 with Gnome? Well
so was I! You must display it first.
Go to:
Trisquel Start Icon > System Settings > Main Menu:
Select the 'Accessories' catagory.
Scroll through the Accessories catagory and locate 'System Monitor'.
If the check box is not ticked beside 'System Monitor' check it!
Select 'Close'
Go to:
Trisquel Start Icon > Accessories:
System Monitor should now be visible in this menu.
An important application to have access to so I believe it should be visible
in Trisquel's Gnome by default, but it isn't, so follow the instructions
above for now.