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I am trying to install the Singal desktop application on my Ubuntu 20.10 using the commands here. They are as given below:

# 1. Install our official public software signing key
wget -O- https://updates.signal.org/desktop/apt/keys.asc | sudo apt-key add -

2. Add our repository to your list of repositories


echo "deb [arch=amd64] https://updates.signal.org/desktop/apt xenial main" | sudo tee -a /etc/apt/sources.list.d/signal-xenial.list


3. Update your package database and install signal


sudo apt update && sudo apt install signal-desktop

It get stuck at step #1 only. I tried downloading key manualling and then adding it using sudo apt-key add 'keys.asc but it gave me the same error.

Error:

Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
gpg: invalid key resource URL '/tmp/apt-key-gpghome.AVkbXq0uHG/home:manuelschneid3r.asc.gpg'
gpg: keyblock resource '(null)': General error
gpg: key 7721F63BD38B4796: 2 signatures not checked due to missing keys
gpg: key 40976EAF437D05B5: 60 signatures not checked due to missing keys
gpg: key 76F1A20FF987672F: 1 signature not checked due to a missing key
gpg: key 1488EB46E192A257: 1 signature not checked due to a missing key
gpg: key 1488EB46E192A257: 1 signature not checked due to a missing key
gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys
gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key
gpg: Total number processed: 20
gpg:       skipped new keys: 20
Naman Chauhan
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  • Those repos are for Xenial, which is 16.04. You’ll likely need to find Signal repos for Focal instead. –  Jan 10 '21 at 07:56
  • @Matigo I believe keys are the same for all in step 1. It is step 2 where the distribution is mentioned as xenial. – Naman Chauhan Jan 11 '21 at 12:59

2 Answers2

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I went down a very long rabbit hole on this same issue, and found that I needed to eliminate a bad key file:

sudo rm /etc/apt/trusted.gpg.d/home:manuelschneid3r.asc

.. then run the steps again; worked like a champ.

JesseDyer
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Deleting home:selmf.asc and home:selmf.gpg from /etc/apt/trusted.gpg.d/ fixed it for me.

Either move the files to your home directory so in case something breaks you can revert it:

mv "/etc/apt/trusted.gpg.d/home:selmf.asc" "/etc/apt/trusted.gpg.d/home:selmf.gpg" ~/

or delete them completely:

rm "/etc/apt/trusted.gpg.d/home:selmf.asc" "/etc/apt/trusted.gpg.d/home:selmf.gpg"
dako98
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