At some point, I installed a new kernel, for no particular purpose but to try.
I am having some problems, and would like to ensure that they are not caused by the kernel I installed.
How can I generally find out whether I'm using the newest available official kernel? If I'm not, how can I then change (up- or downgrade) to the latest official version?
(I'm using Ubuntu 12.04, running kernel 3.3.0-030300-generic)