cannot install anything via apt-get. problem with apt-get update

Question

I am unable to install anything with apt-get. I think this problem is due to gpg error of some kind. I have done almost everything on the net as per my belief. This is what happens when I run apt-get update.

mody@ubuntu:~$ sudo apt-get update
Get:1 http:/dl.google.com stable Release.gpg                                  
Get:2 http:/dl.google.com stable Release                                      
Ign http:/dl.google.com stable Release                                        
E: GPG error: http:/dl.google.com stable Release: The following signatures were invalid: NODATA 1 NODATA 2
mody@ubuntu:~$ 

I tried these

mody@ubuntu:~$ sudo apt-get clean
mody@ubuntu:~$ sudo apt-get update && sudo apt-get upgrade
Get:1 http:/dl.google.com stable Release.gpg
Get:2 http:/dl.google.com stable Release                                      
Ign http:/dl.google.com stable Release                                        
E: GPG error: http:/dl.google.com stable Release: The following signatures were invalid: NODATA 1 NODATA 2

Didn't work

mody@ubuntu:~$ sudo apt-get update -o Acquire::http::No-Cache=True
Get:1 http:/dl.google.com stable Release.gpg
Get:2 http:/dl.google.com stable Release                                      
Ign http:/dl.google.com stable Release                                        
E: GPG error: http:/dl.google.com stable Release: The following signatures were invalid: NODATA 1 NODATA 2

Didn't work

mody@ubuntu:~$ sudo apt-get update -o Acquire::BrokenProxy=true 
Get:1 http:/dl.google.com stable Release.gpg
Get:2 http:/dl.google.com stable Release                                      
Ign http:/dl.google.com stable Release                                        
E: GPG error: http:/dl.google.com stable Release: The following signatures were invalid: NODATA 1 NODATA 2
mody@ubuntu:~$ 

Even this

Click System>>Administration>>Software Sources Click the Download From menu and choose Main Server Type the following in terminal.

sudo apt-get update

Run the update manager again.

But did not work

I also changed the sources with one available on ubuntu site. i dont know why i did that but that didn't help

Did a force update. problem persists.

mody@ubuntu:~$ sudo apt-get update -f

[sudo] password for mody: 
Get:1 http:/dl.google.com stable Release.gpg
Get:2 http:/dl.google.com stable Release                                      
Ign http:/dl.google.com stable Release                                        
E: GPG error: http:/dl.google.com stable Release: The following signatures were invalid: NODATA 1 NODATA 2

Frustrated.

Synaptic is not installed as well as aptitude. changing download server to everything possible from anything did not help either.

PS: link were giving me problem with posting so I delete / where // were present

Solution

The key for signing downloaded packages from the google Linux software repository may need to be re-imported. This can be done with the following line in a terminal

wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -

Alternatively we can also download and save the key to then import it manually.

Source: Google

Comments

[Avinash Raj]

@Azker as this sudo apt-get install -f command do a force update?

[Viktor K]

edit your question and post the output of 'cat /etc/apt/sources.list' and 'ls /etc/apt/sources.list.d/'. I'm sure there are some left entries in those directories. You can also go to System>>Administration>>Software Sources and on tab Other Software uncheck all with dl.google.com

[AzkerM]

EDIT: Try a force update > sudo apt-get update -f .. @AvinashRaj - thank you for pointing out.

[Avinash Raj]

-f, --fix-broken Fix; attempt to correct a system with broken dependencies in place.@Azker -f doesn't means for force.

[Pramod]

@arhimed that did it. thanks a ton!! System>>Administration>>Software Sources and on tab Other Software uncheck all with dl.google.com