add support for unsigned kernel images #30
Merged
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The Ubuntu Kernel team has changed default naming to linux-image-unsigned (denoting unsigned kernels) from the old denoting of signed images as linux-signed-image. All rc builds are obviously not endorsed by Canonical Ltd and therefore are not signed as official images. This requires some change to the names of the deb archives the KernelUpdateScriptGenerator places in the generated install script.
For now this only seems to impact amd64 and ppc64el, but ppc64el support isn't complete yet and I have no way to test it. This changes the fetch names only for amd64 architectures on kernels after 4.17-rc1 where this change first appears in rc2. This is done with a datetime check denoted by VER_B in the script.
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