[llvm-bugs] [Bug 49560] New: apt packages fail to install on Ubuntu 16.04 Xenial

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49560

            Bug ID: 49560
           Summary: apt packages fail to install on Ubuntu 16.04 Xenial
           Product: Packaging
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: deb packages
          Assignee: unassignedbugs at nondot.org
          Reporter: samuel.d.darwin at gmail.com
                CC: llvm-bugs at lists.llvm.org

Beginning yesterday, or within the last couple days, many clang-packages, such
as clang-11, clang-5, etc. from llvm began to fail their installation.  This
was been reported to me by others as well. 

It seems to be specific to Ubuntu 16.04 (named Xenial), and Docker (although
probably also non-Docker).

The same installations worked fine last week.

Example:

+ sudo -E apt-get -o Acquire::Retries=3 -yq install clang-11 libstdc++-9-dev
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
clang-11 : Depends: libclang-common-11-dev (=
1:11.1.0~++20210204122740+1fdec59bffc1-1~exp1~20210203233413.161) but it is not
going to be installed
E: Unable to correct problems, you have held broken packages. 

More info:

The following were also installed:

sudo -E apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
sudo -E apt-add-repository "deb http://apt.llvm.org/${LLVM_OS}/
llvm-toolchain-${LLVM_OS}-${LLVM_VER} main"

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