Estou tentando executar
$ sudo apt-get upgrade
e aqui está a saída
$ Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
linux-generic-lts-utopic linux-headers-generic-lts-utopic
linux-image-generic-lts-utopic linux-tools-virtual-lts-vivid
The following packages will be upgraded:
apparmor apport apport-gtk bash-completion bind9-host
chromium-codecs-ffmpeg-extra dnsutils firefox firefox-locale-en
flashplugin-installer gir1.2-gdkpixbuf-2.0 gir1.2-gtk-3.0 libapparmor-perl
libapparmor1 libbind9-90 libdns100 libexpat1 libexpat1:i386 libgail-3-0
libgdk-pixbuf2.0-0 libgdk-pixbuf2.0-common libgtk-3-0 libgtk-3-bin
libgtk-3-common libisc95 libisccc90 libisccfg90 liblwres90
libnautilus-extension1a libnss-winbind libpam-winbind libsmbclient
libsnmp-base libsnmp30 libvdpau1 libwbclient0 linux-firmware linux-libc-dev
linux-tools-common nautilus-data oneconf oneconf-common openssh-client
oracle-java8-installer python-oneconf python-samba python3-apport
python3-oneconf python3-problem-report samba samba-common samba-common-bin
samba-dsdb-modules samba-libs samba-vfs-modules smbclient ssh-askpass-gnome
tlp tlp-rdw tzdata winbind xul-ext-ubufox
62 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
Need to get 0 B/81.5 MB of archives.
After this operation, 6,653 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Extracting templates from packages: 100%
Preconfiguring packages ...
dpkg: warning: files list file for package 'liba52-0.7.4' missing; assuming package has no files currently installed
E: Sub-process /usr/bin/dpkg returned an error code (2)
Você pode reinstalar o pacote 'liba52':
apt-get install --reinstall -y liba52-0.7.4
Para instalar isto você pode ter que habilitar o repositório Universe, então consulte Como eu habilito o repositório "Universo"? se você não tem certeza de como fazer isso.
Eu acho que esse problema pode ser causado por uma instalação de erro. Então você deve remover o pacote quebrado. Tente este comando:
sudo apt-get remove some-package --purge
e agora você pode reinstalar liba52
sudo apt-get install liba52-0.7.4