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If I try using the MX package installer, which also shows the PPAs, I get more information.

Depends on: libqt6gui6t64 (>= 6.4.0) but is not installable

Depends on: libqt6network6t64 (>= 6.1.2) but is not installable

Depends on: libqt6widgets6t64 (>= 6.3.0) but is not installable

Depends on: libqt6xml6t64 (>= 6.1.2) but is not installable

and


1. qpwgraph:amd64=1.0.0.2git.197660-1.1 is selected as an upgrade

2. qpwgraph:amd64=1.0.0.2git.197660-1.1 Depends on libqt6gui6t64 (>= 6.4.0)

but none of the choices are Installable:

[no choices]

For Qtractor, it looks like this:

qtractor : Depends on: libqt6gui6t64 (>= 6.4.0) but is not installable

Depends on: libqt6network6t64 (>= 6.1.2) but is not installable

Depends on: libqt6widgets6t64 (>= 6.3.0) but is not installable

Depends on: libqt6xml6t64 (>= 6.1.2) but is not installable

E: Unable to correct problems, you have held broken packages.

E: The following information from --solver 3.0 may provide additional context:

Unable to satisfy dependencies. Reached two conflicting decisions: 
1. qtractor:amd64=1.5.12.9git.09e732-19.1 is selected as a downgrade 
2. qtractor:amd64=1.5.12.9git.09e732-19.1 Depends on libqt6gui6t64 (>= 6.4.0) 
but none of the choices are installable: 
[no choices]