[Bug 2125648] [NEW] Apt output for installation problems is not helpful

[Heinrich Schuchardt]

Public bug reported:

For a Questing build
https://launchpadlibrarian.net/820374022/buildlog_ubuntu-questing-
riscv64.coinor-dylp_1.10.4-3ubuntu1_BUILDING.txt.gz

I see this apt output:

The following packages have unmet dependencies:
 sbuild-build-depends-main-dummy : Depends: debhelper-compat (= 12)
                                   Depends: doxygen-latex but it is not going to be installed
                                   Depends: graphviz but it is not going to be installed
                                   Depends: texlive-formats-extra but it is not going to be installed
E: Unable to satisfy dependencies. Reached two conflicting decisions:
   1. libgs10-common:riscv64=10.05.0dfsg1-0ubuntu2 is not selected for install
   2. libgs10-common:riscv64=10.05.0dfsg1-0ubuntu2 is selected for install because:
      1. sbuild-build-depends-main-dummy:riscv64=0.invalid.0 is selected for install
      2. sbuild-build-depends-main-dummy:riscv64 Depends doxygen-latex
      3. doxygen-latex:riscv64 Depends ghostscript
      4. ghostscript:riscv64 Depends libgs10 (= 10.05.0dfsg1-0ubuntu2)
      5. libgs10:riscv64 Depends libgs10-common (= 10.05.0dfsg1-0ubuntu2)
apt-get failed.
E: Package installation failed

For the user it remains completely in the dark why libgs10:riscv64 would not be installed.
No conflicts leading to non-installation are mentioned.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2125648

Title:
  Apt output for installation problems is not helpful

Status in apt package in Ubuntu:
  New

Bug description:
  For a Questing build
  https://launchpadlibrarian.net/820374022/buildlog_ubuntu-questing-
  riscv64.coinor-dylp_1.10.4-3ubuntu1_BUILDING.txt.gz

  I see this apt output:

  The following packages have unmet dependencies:
   sbuild-build-depends-main-dummy : Depends: debhelper-compat (= 12)
                                     Depends: doxygen-latex but it is not going to be installed
                                     Depends: graphviz but it is not going to be installed
                                     Depends: texlive-formats-extra but it is not going to be installed
  E: Unable to satisfy dependencies. Reached two conflicting decisions:
     1. libgs10-common:riscv64=10.05.0dfsg1-0ubuntu2 is not selected for install
     2. libgs10-common:riscv64=10.05.0dfsg1-0ubuntu2 is selected for install because:
        1. sbuild-build-depends-main-dummy:riscv64=0.invalid.0 is selected for install
        2. sbuild-build-depends-main-dummy:riscv64 Depends doxygen-latex
        3. doxygen-latex:riscv64 Depends ghostscript
        4. ghostscript:riscv64 Depends libgs10 (= 10.05.0dfsg1-0ubuntu2)
        5. libgs10:riscv64 Depends libgs10-common (= 10.05.0dfsg1-0ubuntu2)
  apt-get failed.
  E: Package installation failed

  For the user it remains completely in the dark why libgs10:riscv64 would not be installed.
  No conflicts leading to non-installation are mentioned.

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