root@pc:~# aptitude purge zoom
The following packages will be REMOVED:
dconf-cli{u} gir1.2-ibus-1.0{u} ibus{u} libibus-1.0-5{u} libxcb-xtest0{u} zoom{p}
0 packages upgraded, 0 newly installed, 6 to remove and 12 not upgraded.
Need to get 0 B of archives. After unpacking 290 MB will be freed.
Do you want to continue? [Y/n/?]
root@pc:~# aptitude search dconf-cli
i A dconf-cli - simple configuration storage system - utilities p dconf-cli:i386 - simple configuration storage system - utilities
the first flag "i" tells us that dconf-cli is installed
The next flag "A" stands for automatically installed
root@pc:~# aptitude unmarkauto dconf-cli gir1.2-ibus-1.0 ibus libibus-1.0-5 libxcb-xtest0
root@pc:~# aptitude purge zoom
The following packages will be REMOVED:
zoom{p}
0 packages upgraded, 0 newly installed, 1 to remove and 12 not upgraded.
Need to get 0 B of archives. After unpacking 246 MB will be freed.
Do you want to continue? [Y/n/?]
Source: https://askubuntu.com/questions/17745/how-to-remove-a-deb-without-removing-its-dependencies