Can not install desktop app on lubuntu 20

Hi I am using Lubuntu20, downloaded this file,
but it tells me that the application ‘Ubuntu Software’ does not recognise this file

You can always use GDebi to install .deb files:
sudo apt install gdebi

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or sudo dpkg -i path/to/file.deb, replace path/to/file.deb with the path to the downloaded .deb file you want to install, in this case deltachat-desktop_1.22.2_amd64.deb.

since_ on irc posted completed command for you:

sudo dpkg -i ~/Downloads/deltachat-desktop_1.22.2_amd64.deb

if you use dpkg you need to take care of dependencies, so you have to execute afterwards:

sudo apt-get install -f

or use apt instead of dpkg so you run only one command:

sudo apt install ~/Downloads/deltachat-desktop_1.22.2_amd64.deb

more info: software installation - How to install a deb file, by dpkg -i or by apt? - Unix & Linux Stack Exchange

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And just for the sake of completeness remember that you also have the universal AppImage and the Flatpak/Flathub version which is the one I’m using from a time now without any issues (except for the extra disc space but with the benefit of simple updates…).

Best regards!

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Sorry for late response. And thank you for helping.
If I remember correctly it finally worked by opening software manager first and searching for

It worked following these instructions for Ubuntu: