I was able to reproduce this on Intrepid. Steps to reproduce:
1) sudo aptitude install seamonkey
2) sudo aptitude install mozilla
step 2 will tell you about the broken dependency
marking as confirmed, importance low
** Changed in: mozilla (Ubuntu)
Importance: Undecided => Low
Status: New => Confirmed
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Uninstallable due to invalid dependencies
https://bugs.launchpad.net/bugs/300519
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