The problem is fixed now. Today I was able to install digikam.
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https://bugs.launchpad.net/bugs/1871235
Title:
Hash Sum mismatch in digikam packages
To manage notifications about this
Public bug reported:
After clicking in a box in front of a package a blank window occurs
instead of a popup menu with entries like "mark for installation".
Therefore it is not possible to install a package.
lsb_release -rd
Description:Ubuntu Focal Fossa (development branch)
Release:20
Public bug reported:
The installation of digikam fails, because of a hash sum mismatch. Here
is the output:
sudo apt-get install digikam
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
digikam-d