Just a note, maybe for future consideration in Etcher itself.
Am running Debian Linux, Testing branch. Additional, under Wayland.
Every time I flash an iso, it fails - something to do with “checksum failed for range” and some number which mean absolutely nothing to me.
In the subject I said “Theoretical” - on booting the usb stick, it appears to be perfectly fine.
Never had this running with X11, so am led to conclude is to do with Wayland.
Yes, Wayland still has a few little paper-cuts still, but nothing (for me, anyway) of any importance - little irritations are expected and quite easily lived with.
However, every day it is becoming clearer that X11 is going bye-bye, to be replaced by Wayland. Good Thing, too.
So, if Wayland is to become the “new” display protocol, Balena Etcher will need to adapt accordingly.
Anyhow, just download the latest version on Balena.io, not yet set up, will see if non-issue continues to exist.
But at least, if any Linux user complains of failed flashes, in the meantime, one can simply ask: “did you try booting the usb stick?”