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Going through the Ubuntu Kernel git source there are several tags, the meaning of which I'm uncertain of.

How can I find out which tag is the one currently in the repos for each version of Ubuntu? Is it okay to compile the latest tagged versions of the kernel?

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In each Ubuntu Kernel Team git repository the Ubuntu-* tags represent the git commit which was used to build the official source package for any particular upload. For instance in the ubuntu-precice git the tag Ubuntu-3.2.0-23.36 represents the 3.2.0-23.36 source upload. Some tags have an additional -lts- component indicating they are the official LTS backport for the containing release, in the ubuntu-lucid git repository the tag Ubuntu-lts-3.0.0-18.31 represents the 3.0.0-18.31 oneiric LTS backport for lucid.

You can use the Launchpad versions page for the linux package to determine the current versions uploaded into each pocket of each release:

https://www.launchpad.net/ubuntu/+source/linux

All recent tags should be signed by the committer to prevent modification. You should be safe to build any official tag and expect to get a substantially similar result to the uploaded binary packages for that release.

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