Por que o dist-upgrade e o upgrade fornecem pacotes diferentes?

Question

sudo apt-get upgrade

dá:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  libavcodec54 libavformat54
0 to upgrade, 0 to newly install, 0 to remove and 2 not to upgrade.

e

sudo apt-get dist-upgrade

dá:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  libavformat54
0 to upgrade, 0 to newly install, 0 to remove and 1 not to upgrade.

Por que quando eu faço um% normalupgrade, ambos são libavcodec54 e libavformat54 retidos, mas quando eu faço dist-upgrade only libavformat54 é mantido?

    

Answer 1

Como são objetivos diferentes em termos de APT, apt dist-upgrade atualiza o sistema atualizando, instalando e removendo; apt-get upgrade atualiza apenas atualizando pacotes, apt upgrade atualiza o sistema atualizando e instalando pacotes.