I have an installation of Knoppix 4.0.2
and my apt-get showed dependencies error, it goes like this :

Code:
The following packages have unmet dependencies:
  opera: Depends: libqt3-mt (>= 3.3.4) but it is not installed
E: Unmet dependencies. Try using -f.
then I tried apt-get -f install

and it showed :

Code:
101 upgraded, 106 newly installed, 449 to remove and 1602 not upgraded.
1 not fully installed or removed.
Need to get 186MB of archives.
After unpacking 1132MB disk space will be freed.
Do you want to continue? [Y/n]
most of 449 packages it wants to delete, are my favorite application. So, I hit 'n'

how do I solve this dep error ?