[DSE-Dev] Bug#979970: libselinux1: dependency to newer libc6 ignored by/missing for aptitude

[Charlemagne Lasse]

Package: libselinux1
Version: 2.8-1+b1
Severity: grave

Right now, an update from buster to bullseye on amd64 completely
bricks the system because libselinux1 is requiring a libc6 which is
not yet installed on the system:

    Preparing to unpack .../0-libselinux1_3.1-2+b2_amd64.deb ...
    De-configuring libselinux1:i386 (2.8-1+b1) ...
Unpacking libselinux1:amd64 (3.1-2+b2) over (2.8-1+b1) ...
    tar: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.30' not
found (required by /lib/x86_64-linux-gnu/libselinux.so.1)
    dpkg-deb: error: tar subprocess returned error exit status 1

It is then not possible anymore to recover the system because dpkg
(mv, ...) is no longer working.

There is most likely some kind dependency missing to let aptitude
known that it must first update libc6 before it can update
libselinux1. At least on this system, the installed version of libc6
for amd64 and i386 was still 2.28-10 when this happened