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Keep getting message when trying to update:

Could not download all repository indexes

The repository may no longer be available or could not be contacted because of network problems. If available an older version of the failed index will be used. Otherwise the repository will be ignored. Check your network connection and ensure the repository address in the preferences is correct.


An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.ussg.iu.edu/linux/ubuntu xenial InRelease: Unknown error executing apt-keyAn error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dl.google.com/linux/talkplugin/deb stable Release: Unknown error executing apt-keyAn error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ppa.launchpad.net/audio-recorder/ppa/ubuntu xenial InRelease: Unknown error executing apt-keyAn error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://mirrors.usinternet.com/mint/packages sarah Release: Unknown error executing apt-keyAn error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.ubuntu.com/ubuntu xenial-security InRelease: Unknown error executing apt-keyAn error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.canonical.com/ubuntu xenial InRelease: Unknown error executing apt-keyAn error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.ussg.iu.edu/linux/ubuntu xenial-updates InRelease: Unknown error executing apt-keyAn error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ftp.ussg.iu.edu/linux/ubuntu xenial-backports InRelease: Unknown error executing apt-keyFailed to fetch http://ppa.launchpad.net/audio-recorder ... /InRelease Unknown error executing apt-keyFailed to fetch http://ftp.ussg.iu.edu/linux/ubuntu/dis ... /InRelease Unknown error executing apt-keyFailed to fetch http://ftp.ussg.iu.edu/linux/ubuntu/dis ... /InRelease Unknown error executing apt-keyFailed to fetch http://ftp.ussg.iu.edu/linux/ubuntu/dis ... /InRelease Unknown error executing apt-keyFailed to fetch http://security.ubuntu.com/ubuntu/dists ... /InRelease Unknown error executing apt-keyFailed to fetch http://archive.canonical.com/ubuntu/dis ... /InRelease Unknown error executing apt-keyFailed to fetch http://dl.google.com/linux/talkplugin/d ... elease.gpg Unknown error executing apt-keyFailed to fetch http://mirrors.usinternet.com/mint/pack ... elease.gpg Unknown error executing apt-keySome index files failed to download. They have been ignored, or old ones used instead.


$ ping http://ftp.ussg.iu.edu/linux/ubuntu
ping: unknown host http://ftp.ussg.iu.edu/linux/ubuntu

The server you're trying to ping is working Click on http://ftp.ussg.iu.edu/linux/ubuntu and it should open.

You should check your repos withinxi -r

$ ping ftp.ussg.iu.edu
PING spout.ussg.indiana.edu (156.56.247.193) 56(84) bytes of data.
64 bytes from spout.ussg.indiana.edu (156.56.247.193): icmp_seq=1 ttl=47 time=59.4 ms
64 bytes from spout.ussg.indiana.edu (156.56.247.193): icmp_seq=2 ttl=47 time=60.2 ms
^C
--- spout.ussg.indiana.edu ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 59.468/59.882/60.297/0.481 ms

Clicked on http://ftp.ussg.iu.edu/linux/ubuntu and it opened. Not sure what to do there.

$ inxi -r
Repos: Active apt sources in file: /etc/apt/sources.list.d/audio-recorder-ppa-xenial.list
deb http://ppa.launchpad.net/audio-recorder/ppa/ubuntu xenial main
deb-src http://ppa.launchpad.net/audio-recorder/ppa/ubuntu xenial main
Active apt sources in file: /etc/apt/sources.list.d/google-talkplugin.list
deb http://dl.google.com/linux/talkplugin/deb/ stable main
Active apt sources in file: /etc/apt/sources.list.d/official-package-repositories.list
deb http://mirrors.usinternet.com/mint/packages sarah main upstream import backport
deb http://ftp.ussg.iu.edu/linux/ubuntu xenial main restricted universe multiverse
deb http://ftp.ussg.iu.edu/linux/ubuntu xenial-updates main restricted universe multiverse
deb http://ftp.ussg.iu.edu/linux/ubuntu xenial-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu/ xenial partner

Try disabling the google repo http://dl.google.com/linux/talkplugin/deb/ as it doesn't seem to reachable at this time.

Do you mean disable or remove? How do I disable it?

borgward wrote:Do you mean disable or remove? How do I disable it?

It doesn't matter, the result is the same.
Open software sources -> PPAs -> remove the checkmark in front of the ppa -> click at the top right the button to refresh the cache.