so the mtime is set to the one mentioned inside the changelog, "Fri, 19
Oct 2018 11:20:34 -0700" and that's what's included in the package, and
by Debian Policy, one should maintain the timestamps as much as
possible.
at the moment we do not provide any guarantees that files in later
series, have higher/same/lower mtime than in previous releases. For
example, a package in xenial may have an SRU to fix a bug, which doesn't
affect and/or has always been fixed in bionic, thus upgrade from xenial
to bionic may see files go back in time w.r.t. mtime.
A backup system that exclusively relies on mtime, or mtime increasing
linearly, will be broken across release-upgrades. After a release-
upgrade a contents/checksum check should be executed to detect changes.
Which backup system are you using?
** Changed in: secureboot-db (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1816045
Title:
secureboot-db: release upgrade from 16.04 to 18.04 modifies
changelog.gz but resets mtime
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