martin@serveralpha:~$ sudo apt install libsasl2-2:amd64
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libsasl2-2 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  sasl2-bin:i386 libsasl2-modules-db:i386 sasl2-bin

E: Package 'libsasl2-2' has no installation candidate