The same happens with normal official package from the repository:
```
cd ~/Downloads
apt download mc
gdebi-gtk mc_3%3a4.8.26-1.1_amd64.deb
```
shows the following in the Gdebi terminal:
```
Selecting previously unselected package mc-data.
(Reading database ... 456803 files and directories currently installed.)
Preparing to unpack .../mc-data_3%3a4.8.26-1.1_all.deb ...
Unpacking mc-data (3:4.8.26-1.1) ...
Setting up mc-data (3:4.8.26-1.1) ...
Processing triggers for man-db (2.9.4-2) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
dpkg: error: unable to read filedescriptor flags for <package status and
progress file descriptor>: Bad file descriptor
```
** Also affects: ubuntu-mate
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1946499
Title:
installation of deb-packages with gdebi-gtk shows "dpkg: error: unable
to read filedescriptor flags for <package status and progress file
descriptor>: Bad file descriptor" in gdebi terminal, package is not
installed
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