When installing screen-desktop_2.1.3_amd64.deb on Linux Mint 20 (derived from Ubuntu 20):
~ $ sudo dpkg -i ~/Downloads/screen-desktop_2.1.3_amd64.deb
Selecting previously unselected package screen-desktop.
(Reading database ... 357957 files and directories currently installed.)
Preparing to unpack .../screen-desktop_2.1.3_amd64.deb ...
Unpacking screen-desktop (2.1.3) ...
Setting up screen-desktop (2.1.3) ...
dpkg: error processing package screen-desktop (--install):
installed screen-desktop package post-installation script subprocess returned error exit status 1
Processing triggers for gnome-menus (3.36.0-1ubuntu1) ...
Processing triggers for desktop-file-utils (0.24+linuxmint1) ...
Processing triggers for mime-support (3.64ubuntu1) ...
Errors were encountered while processing:
~ $ apt show screen-desktop
Package: screen-desktop
Version: 2.1.3
Status: install ok half-configured
Priority: optional
Section: utils
Maintainer: Screen, Inc.
Installed-Size: 259 MB
Depends: libgtk-3-0, libnotify4, libnss3, libxss1, libxtst6, xdg-utils, libatspi2.0-0, kde-cli-tools | kde-runtime | trash-cli | libglib2.0-bin | gvfs-bin
Recommends: pulseaudio | libasound2
Suggests: gir1.2-gnomekeyring-1.0, libgnome-keyring0, lsb-release
Homepage: https://screen.so
Download-Size: unknown
APT-Manual-Installed: yes
APT-Sources: /var/lib/dpkg/status
Description: Low latency videoconferencing & screen sharing with multiplayer drawing & control
Screen is a multiplayer screen sharing app that lets you work
together like you’re in the same room.