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  • Bug#1109174: libfst-dev: fails to upgrade from bookworm because of libf

    From Lucas Nussbaum@21:1/5 to All on Sun Jul 13 10:00:01 2025
    Package: libfst-dev
    Version: 1.7.9-5
    Severity: serious

    While testing upgrades from bookworm to trixie, I ran into the following problem.
    If I:
    - install libfst-dev in bookworm
    - upgrade to trixie (apt update && apt dist-upgrade)
    Then libfst-dev is not upgraded.

    MWE:
    mmdebstrap --chrooted-customize-hook='apt -y install libfst-dev && sed -e s/bookworm/trixie/ -i /etc/apt/sources.list && apt update && apt dist-upgrade -y && apt dist-upgrade -y -o Debug::pkgProblemResolver=true' bookworm /dev/null

    Relevant output:
    Investigating (0) libfst-dev:amd64 < 1.7.9-5 -> 1.8.4-2 @ii umU Ib >
    Broken libfst-dev:amd64 Depends on libfst26:amd64 < none | 1.8.4-2 @un uH > (= 1.8.4-2)
    Considering libfst26:amd64 0 as a solution to libfst-dev:amd64 0
    Holding Back libfst-dev:amd64 rather than change libfst26:amd64
    Try to Re-Instate (1) libfst-dev:amd64
    Done
    Entering ResolveByKeep
    The following packages were automatically installed and are no longer required:
    libapt-pkg6.0 libargon2-1 libgnutls30 libtasn1-6 libunistring2
    Use 'apt autoremove' to remove them.

    Not upgrading:
    libfst-dev

    What happens is that libfst22 and libfst26 cannot be co-installed,
    because libfst22 Conflicts with libfst, which is Provided by libfst26.

    I'm not sure of how to untangle this.

    This affects upgrades of the following packages:
    hfst
    libfst-dev
    libfst-tools
    libhfst-dev
    libhfst55
    python3-hfst
    python3-libhfst

    Lucas

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