Bug#968560: unison-2.48: Bad alternative link for unison

[frydo bugdeb <frydo.bugdeb@gmail.com>]

Package: unison-2.48
Version: 2.48.4-7
Severity: grave
Justification: renders package unusable

Dear Maintainer,

Using unison though network with ssh, since last update I could not have it
work.
Connection was lost right after I give my password.

Launching unison from a shell, I could see that it was looking for a file,
unison, that could not be found.

I found out that it came from the fact that a link /usr/etc/alternatives/unison
(where /usr/bin/unison points to) was pointing on an invalid file,
/usr/bin/unison-latest-stable-gtk, that does not exist.

In my case I had to change that link to point on /usr/bin/unison-gtk



-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (900, 'testing'), (800, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.7.0-2-amd64 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_WARN, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages unison-2.48 depends on:
ii  libc6  2.31-3

Versions of packages unison-2.48 recommends:
ii  openssh-client [ssh-client]  1:8.3p1-1

Versions of packages unison-2.48 suggests:
pn  unison-all  <none>

-- no debconf information