Você tá usando sua conta de administrador?
Se não está use, pois esse é o problema.
Respondendo a sua pergunta, sim eu sou o administrador da minha conta eu sou o unico que uso o meu pc.
Se sim execute pelo terminal:
sudo apt-get update
depois:
sudo apt-get dist-upgrade
cole o resultado aqui pra a gente ver.
Olha ai a saída dos comandos.
$ sudo apt-get update && sudo apt-get upgrade -y
[sudo] password for ubuntu:
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Baixados 255 kB em 23s (10,8 kB/s)
Lendo listas de pacotes... Pronto
Lendo listas de pacotes... Pronto
Construindo árvore de dependências
Lendo informação de estado... Pronto
Os pacotes a seguir serão mantidos em suas versões atuais:
usb-modeswitch-data
0 pacotes atualizados, 0 pacotes novos instalados, 0 a serem removidos e 1 não atualizados.