Can confirm this error. Followed the README steps to add ppa and install the app through the terminal. It fails while assigning permissions:

W: Failed to fetch https://deb.etcher.io/dists/stable/InRelease Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate. Could not handshake: Error in the certificate verification. [IP: 52.41.41.147 443]
W: Some index files failed to download. They have been ignored, or old ones used instead.
merrill@merrill-HP-Pavilion-Laptop-17-ar0xx:~$ sudo apt install balena-etcher-electron
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package balena-etcher-electron

deb.etcher.io was the old BinTray repository, not the new CloudSmith repository? Perhaps one of the Etcher developers ought to update #3501 with instructions for disabling the old BinTray repository (if the user had previously enabled it) ?

balenaEtcher also does not install on Zorin 16.2/Ubuntu 20.04.3

I downloaded the v1.10.2 AppImage, enabled the “Allow executing file as program” option in permissions, and it just opens an empty window.

See also https://forums.balena.io/t/balenaetcher-not-working-on-zorin-os/365919/5

See #3884 (comment) ?

@lurch Thanks!

I downloaded the v1.10.6 AppImage and it seems to be working as expected.

This is fixed in 1.10.6 (just manually tested the 3 latest Ubuntu LTS 18.04, 20.04 and 22.04 to be sure)

Just out of curiosity, do versions of Etcher after #3935 still run on Ubuntu 18.04 LTS?