Comment 21 for bug 208405

Hmm, the package manager is bugging me about this all the time:

# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run `apt-get -f install' to correct these.
The following packages have unmet dependencies:
  iscan: Depends: libltdl3 (>= 1.5.2-2) but it is not installable
E: Unmet dependencies. Try using -f.

How can I tell the package manager to always ignore this, so I can do apt-get upgrade without it wanting to remove it?