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Just installed ubuntu 15.10 but as soon as I try to do sudo apt-get update, following error occurs:

W: GPG error: http://download.opensuse.org  Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 977C43A8BA684223
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/wily-updates/main/source/Sources  Hash Sum mismatch

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/wily-updates/main/binary-amd64/Packages  Hash Sum mismatch

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/wily-updates/main/binary-i386/Packages  Hash Sum mismatch

E: Some index files failed to download. They have been ignored, or old ones used instead.

Here is /etc/apt/sources.list

#deb cdrom:[Ubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021)]/ wily main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu/ wily main restricted
deb-src http://archive.ubuntu.com/ubuntu/ wily main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu/ wily-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu/ wily-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ wily universe
deb-src http://archive.ubuntu.com/ubuntu/ wily universe
deb http://archive.ubuntu.com/ubuntu/ wily-updates universe
deb-src http://archive.ubuntu.com/ubuntu/ wily-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu/ wily multiverse
deb-src http://archive.ubuntu.com/ubuntu/ wily multiverse
deb http://archive.ubuntu.com/ubuntu/ wily-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu/ wily-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ wily-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ wily-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu wily-security main restricted
deb-src http://security.ubuntu.com/ubuntu wily-security main restricted
deb http://security.ubuntu.com/ubuntu wily-security universe
deb-src http://security.ubuntu.com/ubuntu wily-security universe
deb http://security.ubuntu.com/ubuntu wily-security multiverse
deb-src http://security.ubuntu.com/ubuntu wily-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu wily partner
# deb-src http://archive.canonical.com/ubuntu wily partner

Any help?

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  • This error occurs when I run sudo apt-get update
    – SSC
    Feb 7, 2016 at 13:32

2 Answers 2

1

The error message you got:

W: GPG error: http://download.opensuse.org Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 977C43A8BA684223

Means you have to add that missing key 977C43A8BA684223 by redownloading the keys first:

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

Then type:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 977C43A8BA684223 
sudo apt-get update
10
  • Why this happens?
    – Croll
    Feb 7, 2016 at 13:49
  • Your message error happened because you don't have a suitable public key for the repository you added. So you need to retrieve the key from Ubuntu key server.
    – user284234
    Feb 7, 2016 at 13:55
  • Now this is the error: W: Failed to fetch us.archive.ubuntu.com/ubuntu/dists/wily-updates/main/source/… Hash Sum mismatch W: Failed to fetch us.archive.ubuntu.com/ubuntu/dists/wily-updates/main/… Hash Sum mismatch W: Failed to fetch us.archive.ubuntu.com/ubuntu/dists/wily-updates/main/… Hash Sum mismatch E: Some index files failed to download. They have been ignored, or old ones used instead.
    – SSC
    Feb 7, 2016 at 14:04
  • @PleaseDeleteMeAfter executing your commands, these errors happen. Now Keys missing error do not happen anymore.
    – SSC
    Feb 7, 2016 at 14:08
  • 1
    @PleaseDeleteMe I shutdown my machine last night and today when I started again, it was working. No idea what solved it but I hope it was one of your solution(s). Thanks for help.
    – SSC
    Feb 8, 2016 at 9:42
0

I believe you're missing keys from the Ubuntu key server. Try this:

# sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 977C43A8BA684223

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