Bug#972550: steam: fails to install steam

[Mayank Suman]

Source: steam
Severity: important

Dear Maintainer,


   * What led up to the situation?
    Trying to install steam (`sudo apt install steam`) fails due to
    unment depedency. The exact error is 

    The following packages have unmet dependencies:
 libgl1-mesa-dri:i386 : Depends: libllvm10:i386 (>= 1:9~svn298832-1~) but it is not going to be installed
  E: Unable to correct problems, you have held broken packages.


   * What exactly did you do that was ineffective?

     I tried to install libllvm10:i386, but `apt` suggested that I have
     to install most of pre-installed stuffs (>1200 MB) to install the
     package. Clearly not an option. I am attaching the output of `apt policy libllvm10 libllvm10:i386 libgl1-mesa-dri libgl1-mesa-dri:i386 steam`
  libllvm10:
    Installed: 1:10.0.1-6
    Candidate: 1:10.0.1-6
    Version table:
   *** 1:10.0.1-6 500
          500 http://deb.debian.org/debian testing/main amd64 Packages
          100 /var/lib/dpkg/status
  libllvm10:i386:
    Installed: (none)
    Candidate: 1:10.0.1-6+b1
    Version table:
       1:10.0.1-6+b1 500
          500 http://deb.debian.org/debian testing/main i386 Packages
  libgl1-mesa-dri:
    Installed: 20.1.9-1
    Candidate: 20.1.9-1
    Version table:
   *** 20.1.9-1 500
          500 http://deb.debian.org/debian testing/main amd64 Packages
          100 /var/lib/dpkg/status
  libgl1-mesa-dri:i386:
    Installed: (none)
    Candidate: 20.1.9-1
    Version table:
       20.1.9-1 500
          500 http://deb.debian.org/debian testing/main i386 Packages
  steam:i386:
    Installed: (none)
    Candidate: 1.0.0.66-2
    Version table:
       1.0.0.66-2 500
          500 http://deb.debian.org/debian testing/non-free i386 Packages

   * What outcome did you expect instead?
    steam should install along with all its dependencies.

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-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.8.0-3-amd64 (SMP w/16 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_IN, LC_CTYPE=en_IN (charmap=UTF-8), LANGUAGE=en_IN:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled