Alexey Klimenko and I checked it out on a test server and found that:

 * A new 64-bit user is unable to login with Telegram Desktop before
   v3.0.2 (beta version, was not packaged).
 * A 32-bit user with the old app do not see a new user, instead the one
   of them sees @UnsupportedUser64Bot, not real account.
 * An old user is unable to write to a new user, but a new one can. This
   is like simplex communication.
 * An old user can't distinguish different new users. They all write in
   the same dialog.
 * New users do not appear on contact list in the old app.

There may be other issues. But as for "stop working", I overestimated.
Existing installations will continue to work but with degraded
operability. There are two rather big commits which introduce 133 scheme
layer with a fix for 64-bit UIDs.

https://github.com/telegramdesktop/tdesktop/commit/a6c98f4bb44c8a5f55f86ea80f932a5d0a8be1e3
https://github.com/telegramdesktop/tdesktop/commit/e4e5c4a1d23a271dd2b38d6925917b50932191ad

Unfortunately, they do not apply cleanly against versions currently in
Ubuntu, 2.1.7 or 2.6.1. Adapting the patches will be a pretty difficult
task with unreliable result. John Preston, an upstream author, suggested
to do a full update of the package.

I know Ubuntu has backports pocket for so huge updates. But it seems the
backporting process is not started yet.

On Вс, 2021-10-10 at 16:46 +0000, Robie Basak wrote:
> Users who prefer the other side of the trade-off already
> have that choice via the telegram-desktop snap.

Sorry, I do not use snapd.

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https://bugs.launchpad.net/bugs/1942699

Title:
  SRU: Update Telegram Desktop to 2.9.2

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