This is the depends list on my PC after having removed Skype 2.2 and installed Skype 4.0.
skype Depends: lib32stdc++6
Depends: lib32asound2
Depends: ia32-libs
Depends: libc6-i386
Depends: lib32gcc1
Conflicts: <skype-mid>
Conflicts: <skype-mid:i386>
Conflicts: <skype-common>
Conflicts: <skype-common:i386>
Replaces: <skype-mid>
Replaces: <skype-mid:i386>
Replaces: <skype-common>
Replaces: <skype-common:i386>
Conflicts: skype:i386
Depends: lib32asound2
Depends: ia32-libs
Depends: libc6-i386
Depends: lib32gcc1
Conflicts: <skype-mid>
Conflicts: <skype-mid:i386>
Conflicts: <skype-common>
Conflicts: <skype-common:i386>
Replaces: <skype-mid>
Replaces: <skype-mid:i386>
Replaces: <skype-common>
Replaces: <skype-common:i386>
Conflicts: skype:i386
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