Cannot access the ubuntu.com website to verify GPG (PGP?) keys

[AbleTassie]

Apparently I am having a problem accessing the keyserver at Ubuntu.com, requests repeatedly "time out."Apparently others are not having the problem and it is peculiar to my PC. I downloaded an iso of Ubuntu 16.04.2 today and checked the SHA256SUM and got a SUM back, But I cannot verify the GPG (PGP?) keys.

When I try to follow the protocol here https://help.ubuntu.com/community/VerifyIsoHowto I cannot get beyond the step "Obtain the Public Key from the Ubuntu KeyServer" it times out (see Terminal output below).

I can visit the website http://keyserver.ubuntu.com/ in my browser and I can see "SKS OPenPGP Public Key Server" on that page. But I cannot ping the server and when I run the command: dig +short keyserver.ubuntu.com the output below on the last line

QUESTION: Can anybody advise me what is wrong?

Thank you,

Able

Terminal from checking SHA256SUM and trying to verify PGP keys, etc.:

name@name-Lenovo-IdeaPad-Y510:~$ cd

name@name-Lenovo-IdeaPad-Y510:~$ cd Downloads
name@name-Lenovo-IdeaPad-Y510:~/Downloads$ sha256sum -b *.iso
0f3086aa44edd38531898b32ee3318540af9c643c27346340d eb2f9bc1c3de7e *ubuntu-16.04.2-desktop-amd64.iso
name@name-Lenovo-IdeaPad-Y510:~/Downloads$ gpg --verify SHA256SUMS.gpg SHA256SUMS
gpg: Signature made Thu 16 Feb 2017 04:04:27 PM PST using DSA key ID FBB75451
gpg: Can't check signature: public key not found
gpg: Signature made Thu 16 Feb 2017 04:04:27 PM PST using RSA key ID EFE21092
gpg: Can't check signature: public key not found
name@name-Lenovo-IdeaPad-Y510:~/Downloads$ gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 0xFBB75451 0xEFE21092
gpg: requesting key FBB75451 from hkp server keyserver.ubuntu.com
gpg: requesting key EFE21092 from hkp server keyserver.ubuntu.com
gpg: keyserver timed out
gpg: keyserver receive failed: keyserver error
name@name-Lenovo-IdeaPad-Y510:~/Downloads$ ping keyserver.ubuntu.com
PING keyserver.ubuntu.com (91.189.90.55) 56(84) bytes of data.
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
name@name-Lenovo-IdeaPad-Y510:~$ dig +short keyserver.ubuntu.com

91.189.90.55
91.189.89.49
name@name-Lenovo-IdeaPad-Y510:~$

[sudodus]

Maybe there was a temporary error. It works for me now to get the keys.

[AbleTassie]

Maybe there was a temporary error. It works for me now to get the keys. Thanks sudodus, No I think it is my OS. I just switched from the HDD to a pen drive USB and was able to ping and access the site and go through the verification protocol here https://help.ubuntu.com/community/VerifyIsoHowto without problems. But last night and this am I could not access with my HDD Lubuntu. When I boot into Lubuntu on the HDD I am getting a long list of apparent problems instead of just "/dev/sda1: clean, 184181/303334976 files, 4052381/121312000 blocks" So I am not sure what the problem is. But it looks like it's the HDD OS Lubuntu, corrupted perhaps in some way. Thanks, A.

[AbleTassie]

PS I thought the problem might have something to do with Firejailing Firefox. But I was able to ping the server and also go through the protocol above when using the pen drive OS, even though Firefox was Firejailed. Thanks, A.