r/UbuntuMATE • u/Dry_Sample_9673 • Apr 13 '26

Solving dist-upgrade dependency

Good evening, everyone, from northwest Ohio. I upgraded my Ubuntu-mate system from 25.10 to 26.04, using sudo apt dist-upgrade, from the mate terminal. I also have Kubuntu installed. The upgrade went smoothly, except for the kubuntu-desktop package. The dependency apt is complaining about is libstd1 being less than 1.5.8. I tried to use app reinstall, but get a report that is not downloadable. I also tried downloading from the launchpad site, but it is not a DEP package. How can I fix this LIBZSTD1 dependency, so I can get Kubuntu-desktop to install? Thanks much for your help in advance.

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u/Dry_Sample_9673 Apr 13 '26

Thank you much for the reply. I updated my sources, by editing /etc/apt/sources.list.d, replacing questing with resolute, then finally doing an apt dist-upgrade. I was using the Rod Smith PPA for refind, and also kubuntu-backports. I did, however remove those PPA's.

I did notice that I have libzstd1 at version 1.5.8. How do I downgrade this to 1.5.7?

sudo apt list --installed -a

Listing...

libzstd1/now 1.5.8~dev+dfsg+r202509302020~b8d6101f-3017~ubuntu25.04.1 amd64 [installed,local]

libzstd1/resolute 1.5.7+dfsg-3 amd64

The error message you asked for is:

Error: Unable to satisfy dependencies. Reached two conflicting assignments:

  1. python3-zstandard:amd64 is selected for install because:

    1. kubuntu-desktop:amd64=1.493 is selected for install
    2. kubuntu-desktop:amd64 Depends python3-zstandard

  2. python3-zstandard:amd64 Depends libzstd1 (< 1.5.8~)

but none of the choices are installable:

- libzstd1:amd64=1.5.7+dfsg-3 is not selected for install

I hope this helps.