[ubuntu] Weaning off of Update Manager in favor of apt-get

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http://ubuntuforums.org – New to Ubuntu. Experienced with CentOS and yum. I have 12.04 LTS Desktop 64-bit for now and I'm trying to wean myself off of all the GUIs so that I can make a move to Server so as to boost my VM capabilities. Question: How can I tell from the CLI whether a Kernel update is available? The GUI Update Manager says I'm due for a kernel update ( -> But 'sudo apt-get -s upgrade' doesn't say the kernel would be upgraded. All it says is that linux-generic, linux-headers-generic, and linux-image-generic have been kept back. I've also tried 'sudo apt-get update', but it do (Hardware)