Obrigado @Serg por responder minhas perguntas! Bem, eu resolvi isso, e isso é fácil de resolver. Eu postei aqui para qualquer um que tenha o mesmo objetivo! Aqui:
$ sudo apt-get purge libpcap0.8-dev libpcap0.8:i386 libpcap-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
libpcap-dev* libpcap0.8:i386* libpcap0.8-dev*
0 upgraded, 0 newly installed, 3 to remove and 75 not upgraded.
2 not fully installed or removed.
After this operation, 1.034 kB disk space will be freed.
Do you want to continue? [Y/n] Y
(Reading database ... 204350 files and directories currently installed.)
Removing libpcap0.8:i386 (1.5.3-2) ...
Purging configuration files for libpcap0.8:i386 (1.5.3-2) ...
Removing libpcap-dev (1.5.3-2) ...
Removing libpcap0.8-dev (1.5.3-2) ...
Processing triggers for libc-bin (2.19-0ubuntu6.5) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Setting up libpcap0.8:amd64 (1.4.0-2) ...
Processing triggers for libc-bin (2.19-0ubuntu6.5) ...
É tão simples.
Apenas sudo apt-get purge libpcap0.8-dev libpcap0.8:i386 libpcap-dev
.