Erros no gerenciador de pacotes no meu Ubuntu [duplicado]

Question

Eu tenho esse problema com a atualização do ubuntu apt-get link

ubilli@ubilli-pc ~> sudo apt-get update
[sudo] password for ubilli:
Ign http://ppa.launchpad.net precise InRelease                                
Ign http://ppa.launchpad.net precise InRelease                                
Ign http://ppa.launchpad.net precise InRelease  
.    
.
.
Ign http://ppa.launchpad.net precise/main Translation-en                      
Hit http://us.archive.ubuntu.com saucy-updates/universe Translation-en        
Fetched 459 kB in 25s (17.7 kB/s)                                              
Reading package lists... Done
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn\'t be verified because the public key is not available: NO_PUBKEY D1106511179518B2
W: There is no public key available for the following key IDs:
3B4FE6ACC0B21F32
W: There is no public key available for the following key IDs:
3B4FE6ACC0B21F32

    

Answer 1

Você está sem uma chave e o apt não consegue autenticar o repositório. Execute este comando para corrigir:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3B4FE6ACC0B21F32

    

Answer 2

Execute isto:

sudo apt-get clean
cd /var/lib/apt
sudo mv lists lists.old
sudo mkdir -p lists/partial
sudo apt-get update

[UPDATE]

Executar:

gpg --recv-keys 3B4FE6ACC0B21F32

Então:

gpg --export 3B4FE6ACC0B21F32 | apt-key add --