libappindicator3-1 is no longer in the debian repositories.

[lucasmsoares96]

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The .deb file is dependent on the libappindicator3-1 library. However this library was replaced by libayatana-appindicator3-1 from debian bullsye.

[lucrp]

I had the same problem trying to install the package in Debian 11.

[ghost]

If you're willing to get your hands dirty, pomotroid can be installed on Debian 11 as so:

• download latest .deb
• sudo apt install libayatana-appindicator3-1 (should be installed by default)
• dpkg-deb -x pomotroid-0.13.0-linux.deb unpacked
• dpkg-deb --control pomotroid-0.13.0-linux.deb unpacked/DEBIAN
• open unpacked/DEBIAN/control in a text editor
• replace libappindicator3-1 with libayatana-appindicator3-1
• save and return to original directory
• dpkg -b unpacked pomotroid-fixed.deb
• sudo apt install ./pomotroid-fixed.deb