We are a small shop, with no real sysadmin. So developers (Java EE) also try to maintain Ubuntu server 12.04.
When I login a terminal and I see messages like:
6 packages can be updated. 6 updates are security updates.
Should all security updates always be installed? Can some be ignored? Should these be acted upon immediately? Or one could wait for 2:00 a.m. on the coming Sunday? Is there a way to know a "critical" update?
Is there a good sysadmin for dummies resource I should be reading?