Prezados,
Enfrento o mesmo problemas, no "Ubuntu Software" não é possível atualizar nenhum aplicativo.
Fiz os procedimentos indicados aqui, segue abaixo.
Aguado um retorno.
guioak@x555lf:~$ lsb_release -rd
Description: Ubuntu 16.04.2 LTS
Release: 16.04
guioak@x555lf:~$ uname -srvm
Linux 4.4.0-79-generic #100-Ubuntu SMP Wed May 17 19:58:14 UTC 2017 x86_64
guioak@x555lf:~$ egrep -v '^#|^ *$' /etc/apt/sources.list /etc/apt/sources.list.d/*
/etc/apt/sources.list:deb
http://br.archive.ubuntu.com/ubuntu/ xenial main restricted
/etc/apt/sources.list:deb
http://br.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
/etc/apt/sources.list:deb
http://br.archive.ubuntu.com/ubuntu/ xenial universe
/etc/apt/sources.list:deb
http://br.archive.ubuntu.com/ubuntu/ xenial-updates universe
/etc/apt/sources.list:deb
http://br.archive.ubuntu.com/ubuntu/ xenial multiverse
/etc/apt/sources.list:deb
http://br.archive.ubuntu.com/ubuntu/ xenial-updates multiverse
/etc/apt/sources.list:deb
http://br.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
/etc/apt/sources.list:deb
http://security.ubuntu.com/ubuntu xenial-security main restricted
/etc/apt/sources.list:deb
http://security.ubuntu.com/ubuntu xenial-security universe
/etc/apt/sources.list:deb
http://security.ubuntu.com/ubuntu xenial-security multiverse
/etc/apt/sources.list.d/nilarimogard-ubuntu-webupd8-xenial.list.save:deb
http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial main
/etc/apt/sources.list.d/steam.list:deb [arch=amd64,i386]
http://repo.steampowered.com/steam/ precise steam
/etc/apt/sources.list.d/steam.list:deb-src [arch=amd64,i386]
http://repo.steampowered.com/steam/ precise steam
/etc/apt/sources.list.d/steam.list.save:deb [arch=amd64,i386]
http://repo.steampowered.com/steam/ precise steam
/etc/apt/sources.list.d/steam.list.save:deb-src [arch=amd64,i386]
http://repo.steampowered.com/steam/ precise steam
/etc/apt/sources.list.d/tiheum-ubuntu-equinox-xenial.list:deb
http://ppa.launchpad.net/tiheum/equinox/ubuntu xenial main
/etc/apt/sources.list.d/tiheum-ubuntu-equinox-xenial.list.save:deb
http://ppa.launchpad.net/tiheum/equinox/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list:deb
http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list.save:deb
http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
guioak@x555lf:~$ sudo apt update
[sudo] senha para guioak:
Obter:1
http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Obter:2
http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages [344 kB]
Atingido:3
http://repo.steampowered.com/steam precise InRelease
Ign:4
http://ppa.launchpad.net/tiheum/equinox/ubuntu xenial InRelease
Obter:5
http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial InRelease [17,6 kB]
Err:6
http://ppa.launchpad.net/tiheum/equinox/ubuntu xenial Release
404 Not Found
Obter:7
http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages [323 kB]
Obter:8
http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial/main amd64 Packages [63,8 kB]
Obter:9
http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial/main i386 Packages [62,4 kB]
Atingido:10
http://br.archive.ubuntu.com/ubuntu xenial InRelease
Obter:11
http://br.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Obter:12
http://br.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Obter:13
http://br.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [620 kB]
Obter:14
http://security.ubuntu.com/ubuntu xenial-security/main Translation-en [145 kB]
Obter:15
http://security.ubuntu.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [60,0 kB]
Obter:16
http://security.ubuntu.com/ubuntu xenial-security/main DEP-11 64x64 Icons [48,1 kB]
Obter:17
http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages [156 kB]
Obter:18
http://br.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages [596 kB]
Obter:19
http://br.archive.ubuntu.com/ubuntu xenial-updates/main Translation-en [251 kB]
Obter:20
http://br.archive.ubuntu.com/ubuntu xenial-updates/main amd64 DEP-11 Metadata [305 kB]
Obter:21
http://security.ubuntu.com/ubuntu xenial-security/universe i386 Packages [137 kB]
Obter:22
http://security.ubuntu.com/ubuntu xenial-security/universe amd64 DEP-11 Metadata [48,7 kB]
Obter:23
http://br.archive.ubuntu.com/ubuntu xenial-updates/main DEP-11 64x64 Icons [207 kB]
Obter:24
http://security.ubuntu.com/ubuntu xenial-security/universe DEP-11 64x64 Icons [69,1 kB]
Obter:25
http://br.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [517 kB]
Obter:26
http://br.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [497 kB]
Obter:27
http://br.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 DEP-11 Metadata [171 kB]
Obter:28
http://br.archive.ubuntu.com/ubuntu xenial-updates/universe DEP-11 64x64 Icons [226 kB]
Obter:29
http://br.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 DEP-11 Metadata [5.896 B]
Obter:30
http://br.archive.ubuntu.com/ubuntu xenial-backports/main amd64 DEP-11 Metadata [3.328 B]
Obter:31
http://br.archive.ubuntu.com/ubuntu xenial-backports/universe amd64 DEP-11 Metadata [5.132 B]
Lendo listas de pacotes... Pronto
E: The repository '
http://ppa.launchpad.net/tiheum/equinox/ubuntu xenial Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(
manpage for repository creation and user configuration details.
guioak@x555lf:~$ sudo apt upgrade
Lendo listas de pacotes... Pronto
Construindo árvore de dependências
Lendo informação de estado... Pronto
Você pode querer executar 'apt-get -f install' para corrigí-los.
Os pacotes a seguir têm dependências desencontradas:
libc6-dbg : Depende: libc6 (= 2.23-0ubuntu9) mas 2.23-0ubuntu7 está instalado
libc6-dev : Depende: libc6 (= 2.23-0ubuntu9) mas 2.23-0ubuntu7 está instalado
E: Dependências desencontradas. Tente usar -f.
guioak@x555lf:~$ dpkg --configure -a
dpkg: erro: a operação solicitada requer privilégios de superusuário
guioak@x555lf:~$ apt-get -f instala
E: Command line option 'f' [from -f] is not understood in combination with the other options.
guioak@x555lf:~$