Por exemplo: sudo apt-get install gedit
retorna isso.
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
gedit : Depends: gedit-common (>= 3.10) but it is not going to be installed
Depends: gedit-common (< 3.11) but it is not going to be installed
libqt4-declarative : Depends: libqtcore4 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4.9 is to
be installed
libqt4-network : Depends: libqtcore4 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4.9 is to
be installed
libqt4-script : Depends: libqtcore4 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4.9 is to
be installed
libqt4-scripttools:i386 : Depends: libqt4-script:i386 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but it is not going to be
installed
Depends: libqtcore4:i386 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4 is to be
installed
Depends: libqtgui4:i386 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but it is not going to be
installed
Depends: libstdc++6:i386 (>= 4.1.1) but it is not going to be installed
libqt4-sql : Depends: libqtcore4 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4.9 is to
be installed
libqt4-sql-mysql : Depends: libqtcore4 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4.9 is to
be installed
libqt4-xml : Depends: libqtcore4 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4.9 is to
be installed
libqt4-xmlpatterns : Depends: libqtcore4 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4.9 is to
be installed
libqt4-xmlpatterns:i386 : Depends: libqt4-network:i386 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but it is not going to be
installed
Depends: libqtcore4:i386 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4 is to be
installed
Depends: libstdc++6:i386 (>= 4.1.1) but it is not going to be installed
libqtcore4 : Breaks: libqtcore4:i386 (!= 4:4.8.1-0ubuntu4.9) but 4:4.8.1-0ubuntu4 is to be installed
libqtcore4:i386 : Depends: libglib2.0-0:i386 (>= 2.22.0) but it is not going to be installed
Depends: libstdc++6:i386 (>= 4.6) but it is not going to be installed
Breaks: libqtcore4 (!= 4:4.8.1-0ubuntu4) but 4:4.8.1-0ubuntu4.9 is to be installed
libqtdbus4 : Depends: libqtcore4 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4.9 is to
be installed
libqtgui4 : Depends: libqtcore4 (= 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1) but 4:4.8.1-0ubuntu4.9 is to
be installed
qtcore4-l10n : Breaks: libqtcore4 (< 4:4.8.5+dfsg-1~) but 4:4.8.1-0ubuntu4.9 is to be installed
Breaks: libqtcore4:i386 (< 4:4.8.5+dfsg-1~) but 4:4.8.1-0ubuntu4 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
Eu tentei o "apt-get -f install", o "apt-get update", o "apt-get upgrade", o "apt-get dist-update" e muito mais. Parece ser um problema com "libqtcore4". Eu tentei usar o dpkg para instalá-lo com um arquivo .deb. Eu esvaziei todos os caches possíveis e tentei instalá-lo a partir do centro de software. Por favor me ajude, eu gostaria de usar o apt-get novamente. Obrigado antecipadamente!
Aqui está a política do apt-cache:
$ apt-cache policy libqtcore4
libqtcore4:
Installed: 4:4.8.1-0ubuntu4.9
Candidate: 4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1
Version table:
4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6.1 0
500 http://se.archive.ubuntu.com/ubuntu/ vivid-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu/ vivid-security/main amd64 Packages
4:4.8.6+git64-g5dc8b2b+dfsg-3~ubuntu6 0
500 http://se.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
*** 4:4.8.1-0ubuntu4.9 0
100 /var/lib/dpkg/status
Você não está usando o último libqtcore4 disponível. Cada um dos pacotes quebrados acima é dependente de uma versão muito mais nova do que existe nos repositórios do Vivid, e é por isso que você tem tantas coisas quebradas.
Use o dos repositórios do Ubuntu, ou não use nada que dependa dele. Não há razão para usar as bibliotecas mais antigas, porque quebra o QT Core quando tudo depende do 4.8.6 e não do 4.8.1