I don't fully understand the situation at hand, but let me add some
background.
From the log it seems fairly clear that `lib6.preinst` is the thing that
fails here. It adds two diversions:
dpkg-divert --quiet --add --no-rename --package base-files --divert
"/.${rtlddir#/}.usr-is-merged" "$rtlddir"
dpkg-divert --quiet --add --no-rename --divert
"$rtlddir/$rtld_so.usr-is-merged" "$rtlddir/$rtld_so"
It seems fairly implausible that the "$rtlddir/$rtld_so" would become a
directory for any reason. If that were the case, `dpkg-divert` (being a
dynamic executable) would fail to start. Most likely, it is the first
diversion that fails here. Since the package at hand is `:amd64`,
`rtlddir=/lib64`. So for some reason, `/lib64` is a directory on your
installation and not a symbolic link. In effect, this is (at least
partially) an unmerged system and this is unsupported.
This still is a bug in the sense that the error message is very
confusing. `libc6.preinst` should probably be verifying that `$rtlddir`
really is a symbolic link before adding the diversion. In the end, the
outcome would be the same: When `$rtlddir` is not a symbolic link, all
that `libc6.preinst` can do is fail (with a better error message).
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https://bugs.launchpad.net/bugs/2058648
Title:
package libc6 2.35-0ubuntu3.6 [modified:
usr/share/doc/libc6/NEWS.Debian.gz usr/share/doc/libc6/NEWS.gz
usr/share/doc/libc6/README.hesiod.gz
usr/share/doc/libc6/changelog.Debian.gz
usr/share/lintian/overrides/libc6] failed to install/upgrade: new
libc6:amd64 package pre-installation script subprocess returned error
exit status 2
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