sudo apt-get erro de upgrade [duplicado]

Question

atualizando o Ubuntu este erro ocorre:

$ sudo apt-get upgrade
error Malformed line 1 in source list /etc/apt/sources.list (type) E: The list of sources could not be read

A linha 1 na lista de fontes é esta:

123#deb cdrom:[Ubuntu 16.04.3 LTS _Xenial Xerus_ - Release amd64 (20170801)]/ xenial main restricted 

    

Answer 1

Altere a linha de:

123#deb cdrom:[Ubuntu 16.04.3 LTS _Xenial Xerus_ - Release amd64 (20170801)]/ xenial main restricted

Para:

#deb cdrom:[Ubuntu 16.04.3 LTS _Xenial Xerus_ - Release amd64 (20170801)]/ xenial main restricted