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W: GPG error: http://mxrepo.com mx15 InRelease: The following signatures were invalid: KEYEXPIRED 1548008281
It has now been extended for another 2 years but expired keys don't update automatically. To remove this error and allow updating again, download this updated key: open a terminal in the directory you downloaded it into and run:
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sudo apt-key add mx15repo.txt
n.b. For anybody not logged in the updated key can also be downloaded here:
http://teharris.net/mx15repo.asc