imho: always check what is upgrading - before make a decisions ..
the ubuntu:20.10 now want to upgrade the "libssl1.1"!
docker run --rm -it ubuntu:20.10 bash -c "apt update && apt upgrade"
...
The following packages will be upgraded:
debianutils diffutils findutils gcc-10-base
libgcc-s1 libgnutls30 libprocps8 libssl1.1 libstdc++6
libsystemd0 libudev1 procps sed zlib1g
the ubuntu:20.04 is better
docker run --rm -it ubuntu:20.04 bash -c "apt update && apt upgrade"
...
The following packages will be upgraded:
gcc-10-base libgcc-s1 libstdc++6 zlib1g
the ubuntu:20.10 now want to upgrade the "libssl1.1"!
the ubuntu:20.04 is better