aptitude problem with control file (in stretch)

[Harald Dunkel]

Hi folks,

I've got a problem with upgrading a private package in Stretch. The control
file says:

        Package: sample-lxc
        Architecture: all
        Depends: ${misc:Depends}
                , cgmanager | systemd
                , debootstrap
                , lxc
                , lxc-templates | lxc ( << 3 )
        Recommends: cgroup-tools
                , apparmor
                , uidmap
                , yum
        Conflicts: lxcfs
        Description: LXC framework
         This package provides LXC for our environment.

lxc-templates is available only for lxc >= 3 (Buster or Bullseye), and
then its a must-have in my environment.

Trying to install this package on Stretch aptitude complains about a
missing lxc-templates package, even though the most recent lxc version
1:2.0.11-1~xgo90+1 is installed.

apt and apt-get are fine, AFAICS.

???


Regards
Harri