Hmm, maybe it was just the syntax being wrong. The following line at least succeeded:
--solver aspcud -o APT::Solver::Strict-Pinning=false -o APT::Solver::aspcud::Preferences='-removed,-changed,-new,+count(solution ,APT-Pin:=/995/)' Next up, checking that it does what I want. Just a worry that came up thinking about the request to aspcud: I think it is allowed to come up with solutions that don't involve any package from -proposed/unstable. So I think that if we go this route (and I think we should/must, not only for the issue encountered in this bug), autopkgtest must check that packages from the triggers are NOT from !-proposed/testing. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. https://bugs.launchpad.net/bugs/1760810 Title: Non-pinned available package in -proposed not chosen Status in Auto Package Testing: New Status in apt package in Ubuntu: Invalid Bug description: In autopkgtest we just had this situation: root@humorous-bullfrog:~# cat /etc/apt/preferences Package: * Pin: release a=bionic Pin-Priority: 990 Package: python3.6 Pin: release a=bionic-proposed Pin-Priority: 995 Package: python3.6-venv Pin: release a=bionic-proposed Pin-Priority: 995 Package: libpython3.6-stdlib Pin: release a=bionic-proposed Pin-Priority: 995 Package: python3.6-minimal Pin: release a=bionic-proposed Pin-Priority: 995 Package: libpython3.6-minimal Pin: release a=bionic-proposed Pin-Priority: 995 Package: libpython3.6 Pin: release a=bionic-proposed Pin-Priority: 995 Package: python3.6-examples Pin: release a=bionic-proposed Pin-Priority: 995 Package: python3.6-dev Pin: release a=bionic-proposed Pin-Priority: 995 Package: libpython3.6-dev Pin: release a=bionic-proposed Pin-Priority: 995 Package: libpython3.6-testsuite Pin: release a=bionic-proposed Pin-Priority: 995 Package: idle-python3.6 Pin: release a=bionic-proposed Pin-Priority: 995 Package: python3.6-doc Pin: release a=bionic-proposed Pin-Priority: 995 Package: python3.6-dbg Pin: release a=bionic-proposed Pin-Priority: 995 Package: libpython3.6-dbg Pin: release a=bionic-proposed Pin-Priority: 995 root@humorous-bullfrog:~# apt -oDebug::pkgProblemResolver=true full-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Starting pkgProblemResolver with broken count: 1 Starting 2 pkgProblemResolver with broken count: 1 Investigating (0) libpython3.6-stdlib:amd64 < 3.6.5~rc1-1 -> 3.6.5-3 @ii umU Ib > Broken libpython3.6-stdlib:amd64 Breaks on python3-distutils:amd64 < 3.6.5~rc1-1 @ii mK > (< 3.6.5-2) Considering python3-distutils:amd64 7 as a solution to libpython3.6-stdlib:amd64 22 Added python3-distutils:amd64 to the remove list Fixing libpython3.6-stdlib:amd64 via remove of python3-distutils:amd64 Investigating (0) dh-python:amd64 < 3.20180325ubuntu2 @ii mK Ib > Broken dh-python:amd64 Depends on python3-distutils:amd64 < 3.6.5~rc1-1 @ii mR > Considering python3-distutils:amd64 7 as a solution to dh-python:amd64 15 Added python3-distutils:amd64 to the remove list Fixing dh-python:amd64 via keep of python3-distutils:amd64 Investigating (1) libpython3.6-stdlib:amd64 < 3.6.5~rc1-1 -> 3.6.5-3 @ii umU Ib > Broken libpython3.6-stdlib:amd64 Breaks on python3-distutils:amd64 < 3.6.5~rc1-1 @ii mK > (< 3.6.5-2) Considering python3-distutils:amd64 7 as a solution to libpython3.6-stdlib:amd64 22 Added python3-distutils:amd64 to the remove list Fixing libpython3.6-stdlib:amd64 via remove of python3-distutils:amd64 Investigating (1) dh-python:amd64 < 3.20180325ubuntu2 @ii mK Ib > Broken dh-python:amd64 Depends on python3-distutils:amd64 < 3.6.5~rc1-1 @ii mR > Considering python3-distutils:amd64 7 as a solution to dh-python:amd64 15 Added python3-distutils:amd64 to the remove list Fixing dh-python:amd64 via keep of python3-distutils:amd64 Investigating (2) libpython3.6-stdlib:amd64 < 3.6.5~rc1-1 -> 3.6.5-3 @ii umU Ib > Broken libpython3.6-stdlib:amd64 Breaks on python3-distutils:amd64 < 3.6.5~rc1-1 @ii mK > (< 3.6.5-2) Considering python3-distutils:amd64 7 as a solution to libpython3.6-stdlib:amd64 22 Added python3-distutils:amd64 to the remove list Fixing libpython3.6-stdlib:amd64 via remove of python3-distutils:amd64 Investigating (2) dh-python:amd64 < 3.20180325ubuntu2 @ii mK Ib > Broken dh-python:amd64 Depends on python3-distutils:amd64 < 3.6.5~rc1-1 @ii mR > Considering python3-distutils:amd64 22 as a solution to dh-python:amd64 15 Removing dh-python:amd64 rather than change python3-distutils:amd64 Investigating (3) python3:amd64 < 3.6.4-1 @ii mK Ib > Broken python3:amd64 Depends on dh-python:amd64 < 3.20180325ubuntu2 @ii mR > Considering dh-python:amd64 22 as a solution to python3:amd64 40 Added dh-python:amd64 to the remove list Fixing python3:amd64 via keep of dh-python:amd64 Investigating (3) dh-python:amd64 < 3.20180325ubuntu2 @ii mK Ib > Broken dh-python:amd64 Depends on python3-distutils:amd64 < 3.6.5~rc1-1 @ii mR > Considering python3-distutils:amd64 22 as a solution to dh-python:amd64 40 Added python3-distutils:amd64 to the remove list Fixing dh-python:amd64 via keep of python3-distutils:amd64 Investigating (4) libpython3.6-stdlib:amd64 < 3.6.5~rc1-1 -> 3.6.5-3 @ii umU Ib > Broken libpython3.6-stdlib:amd64 Breaks on python3-distutils:amd64 < 3.6.5~rc1-1 @ii mK > (< 3.6.5-2) Considering python3-distutils:amd64 40 as a solution to libpython3.6-stdlib:amd64 22 Removing libpython3.6-stdlib:amd64 rather than change python3-distutils:amd64 Investigating (4) python3.6:amd64 < 3.6.5~rc1-1 -> 3.6.5-3 @ii umU Ib > Broken python3.6:amd64 Depends on libpython3.6-stdlib:amd64 < 3.6.5~rc1-1 | 3.6.5-3 @ii umR > (= 3.6.5-3) Considering libpython3.6-stdlib:amd64 40 as a solution to python3.6:amd64 21 Removing python3.6:amd64 rather than change libpython3.6-stdlib:amd64 Investigating (4) libpython3-stdlib:amd64 < 3.6.4-1 @ii mK Ib > Broken libpython3-stdlib:amd64 Depends on libpython3.6-stdlib:amd64 < 3.6.5~rc1-1 | 3.6.5-3 @ii umR > (>= 3.6.4-1~) Considering libpython3.6-stdlib:amd64 40 as a solution to libpython3-stdlib:amd64 15 Removing libpython3-stdlib:amd64 rather than change libpython3.6-stdlib:amd64 Investigating (4) libpython3.6:amd64 < 3.6.5~rc1-1 -> 3.6.5-3 @ii umU Ib > Broken libpython3.6:amd64 Depends on libpython3.6-stdlib:amd64 < 3.6.5~rc1-1 | 3.6.5-3 @ii umR > (= 3.6.5-3) Considering libpython3.6-stdlib:amd64 40 as a solution to libpython3.6:amd64 3 Removing libpython3.6:amd64 rather than change libpython3.6-stdlib:amd64 Investigating (5) python3:amd64 < 3.6.4-1 @ii mK Ib > Broken python3:amd64 Depends on python3.6:amd64 < 3.6.5~rc1-1 | 3.6.5-3 @ii umR > (>= 3.6.4-1~) Considering python3.6:amd64 40 as a solution to python3:amd64 40 Removing python3:amd64 rather than change python3.6:amd64 Investigating (5) dh-python:amd64 < 3.20180325ubuntu2 @ii mK Ib > Broken dh-python:amd64 Depends on python3:any:any < none @un H > (>= 3.3.2-2~) Considering python3:amd64 40 as a solution to dh-python:amd64 40 Removing dh-python:amd64 rather than change python3:any:any Investigating (5) netplan.io:amd64 < 0.34.1 @ii mK Ib > Broken netplan.io:amd64 Depends on python3:amd64 < 3.6.4-1 @ii mR > Considering python3:amd64 40 as a solution to netplan.io:amd64 11 Removing netplan.io:amd64 rather than change python3:amd64 Investigating (5) vim:amd64 < 2:8.0.1401-1ubuntu3 @ii mK Ib > Broken vim:amd64 Depends on libpython3.6:amd64 < 3.6.5~rc1-1 | 3.6.5-3 @ii umR > (>= 3.6.4~rc1) Considering libpython3.6:amd64 40 as a solution to vim:amd64 8 Removing vim:amd64 rather than change libpython3.6:amd64 Investigating (5) python3-yaml:amd64 < 3.12-1build2 @ii mK Ib > Broken python3-yaml:amd64 Depends on python3:amd64 < 3.6.4-1 @ii mR > (< 3.7) Considering python3:amd64 40 as a solution to python3-yaml:amd64 8 Removing python3-yaml:amd64 rather than change python3:amd64 Investigating (5) nplan:amd64 < 0.34.1 @ii mK Ib > Broken nplan:amd64 Depends on netplan.io:amd64 < 0.34.1 @ii mR > Considering netplan.io:amd64 40 as a solution to nplan:amd64 7 Removing nplan:amd64 rather than change netplan.io:amd64 Investigating (5) lsb-release:amd64 < 9.20170808ubuntu1 @ii mK Ib > Broken lsb-release:amd64 Depends on python3:any:any < none @un H > (>= 3.4~) Considering python3:amd64 40 as a solution to lsb-release:amd64 7 Removing lsb-release:amd64 rather than change python3:any:any Investigating (5) python3-distutils:amd64 < 3.6.5~rc1-1 @ii mK Ib > Broken python3-distutils:amd64 Depends on python3:amd64 < 3.6.4-1 @ii mR > (>= 3.6.4-1~) Considering python3:amd64 40 as a solution to python3-distutils:amd64 40 Removing python3-distutils:amd64 rather than change python3:amd64 Investigating (5) python3-lib2to3:amd64 < 3.6.5~rc1-1 @ii mK Ib > Broken python3-lib2to3:amd64 Depends on python3:amd64 < 3.6.4-1 @ii mR > (>= 3.6.4-1~) Considering python3:amd64 40 as a solution to python3-lib2to3:amd64 7 Removing python3-lib2to3:amd64 rather than change python3:amd64 Investigating (5) ubuntu-minimal:amd64 < 1.414 @ii mK Ib > Broken ubuntu-minimal:amd64 Depends on lsb-release:amd64 < 9.20170808ubuntu1 @ii mR > Considering lsb-release:amd64 40 as a solution to ubuntu-minimal:amd64 3 Removing ubuntu-minimal:amd64 rather than change lsb-release:amd64 Done Calculating upgrade... Done The following package was automatically installed and is no longer required: vim-runtime Use 'apt autoremove' to remove it. The following packages will be REMOVED: dh-python libpython3-stdlib libpython3.6 libpython3.6-stdlib lsb-release netplan.io nplan python3 python3-distutils python3-lib2to3 python3-yaml python3.6 ubuntu-minimal vim The following packages will be upgraded: libpython3.6-minimal python3.6-minimal 2 upgraded, 0 newly installed, 14 to remove and 0 not upgraded. Need to get 1954 kB of archives. After this operation, 19.3 MB disk space will be freed. Do you want to continue? [Y/n] autopkgtest merrily went ahead and removed all of those packages, which it turns out breaks package extraction, causing a tmpfail and then destroying all workers in turn. --- libpython3.6-stdlib has Breaks: python3-distutils (<< 3.6.5-2) root@humorous-bullfrog:~# apt policy python3-distutils python3-distutils: Installed: 3.6.5~rc1-1 Candidate: 3.6.5~rc1-1 Version table: 3.6.5-2 500 500 http://archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages *** 3.6.5~rc1-1 990 990 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status There is a version available which would satisfy this requirement: root@humorous-bullfrog:~# apt install libpython3.6-stdlib python3-distutils/bionic-proposed Reading package lists... Done Building dependency tree Reading state information... Done Selected version '3.6.5-2' (Ubuntu:18.04/bionic-proposed [all]) for 'python3-distutils' The following additional packages will be installed: libpython3.6 libpython3.6-minimal python3.6 python3.6-minimal Suggested packages: python3.6-venv python3.6-doc binfmt-support The following packages will be upgraded: libpython3.6 libpython3.6-minimal libpython3.6-stdlib python3-distutils python3.6 python3.6-minimal 6 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 5377 kB of archives. After this operation, 13.3 kB disk space will be freed. Do you want to continue? [Y/n] Should apt have selected this version to upgrade, or is there something we should have done differently in autopkgtest to get around this problem? 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