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When I run the sudo apt-get update, it results in the following

 Reading package lists... Done
 W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A1715D88E1DF1F24
 W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 551CE2FB4CBEDD5A
 W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1E9377A2BA9EF27F

By googling I came to know the key is missing, and it can be obtained by running the following command with the corresponding hexadecimal numbers

 saikirangvr@ubuntu:~$ sudo gpg --keyserver subkeys.pgp.net --recv 551CE2FB4CBEDD5A

But I was not able to fix this as this gave me the error

gpg: WARNING: unsafe ownership on configuration file `/home/saikirangvr/.gnupg/gpg.conf'
gpg: external program calls are disabled due to unsafe options file permissions
gpg: keyserver communications error: general error
gpg: keyserver receive failed: general error

I tried many times but I was unable to fix. I was behind a proxy server in my college and I have configured the Ubuntu well to use behind the proxy.

After using 

 sudo chown -R saikirangvr:saikirangvr /home/saikirangvr/.gnupg

the problem of unsafe ownership was gone, and it gave the following....

 sai@ubuntu:~/gpgpu-sim/ispass2009-benchmarks$ gpg --keyserver keyserver.ubuntu.com --recv 1E9377A2BA9EF27F 
 gpg: requesting key BA9EF27F from hkp server keyserver.ubuntu.com
 gpgkeys: key 1E9377A2BA9EF27F not found on keyserver
 gpg: no valid OpenPGP data found.
 gpg: Total number processed: 0
 sai@ubuntu:~/gpgpu-sim/ispass2009-benchmarks$ gpg --keyserver subkeys.pgp.net --recv 1E9377A2BA9EF27F
 gpg: requesting key BA9EF27F from hkp server subkeys.pgp.net
 gpgkeys: key 1E9377A2BA9EF27F not found on keyserver
 gpg: no valid OpenPGP data found.
 gpg: Total number processed: 0

the result of adding the ppa

sai@ubuntu:~$ sudo add-apt-repository ppa:nilarimogard/webupd8
[sudo] password for sai: 
Error reading https://launchpad.net/api/1.0/~nilarimogard/+archive/webupd8: Couldn't resolve host 'launchpad.net'

same error occurs when using launch pad get keys

 sai@ubuntu:~$ sudo launchpad-getkeys

 Please wait... launchpad-getkeys is running an update so 
 it can detect the missing GPG keys

 Trying to import all the missing keys
 gpg: requesting key 4C9D234C from hkp server keyserver.ubuntu.com
 gpgkeys: key 531EE72F4C9D234C not found on keyserver
 gpg: no valid OpenPGP data found.
 gpg: Total number processed: 0
 gpg: requesting key BA9EF27F from hkp server keyserver.ubuntu.com
 gpgkeys: key 1E9377A2BA9EF27F not found on keyserver
 gpg: no valid OpenPGP data found.
 gpg: Total number processed: 0

 launchpad-getkeys has finished importing all missing GPG keys. 
 Try running sudo apt-get update - you shouldn't see any key 
  errors anymore

What is the problem. *Is there any other method to solve this like through GUI *.......

dessert
  • 40,956
sai kiran grandhi
  • 193
  • 1
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2 Answers2

2

Try the following : 

$ sudo add-apt-repository ppa:nilarimogard/webupd8
$ sudo apt-get update
$ sudo apt-get install launchpad-getkeys

Once installed, to import all the missing GPG keys for your PPAs, simply use the following command:

$ sudo launchpad-getkeys

It will run an update and try to import all missing GPG keys for you. After executing it, hope you don't see any GPG errors.

The link is a reference to the solution.

shivshnkr
  • 5,113
1

Fix the ownership of the .gnupg directory: 

sudo chown -R saikirangvr:saikirangvr /home/saikirangvr/.gnupg

After that repeat the key importing command.

By the way, the gpg command has to be issued without sudo, in this way you will not break your file's ownership.

Frantique
  • 8,673