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When I run this command {sudo apt-get update} it cant be executed and the response is:

E: Type 'gpg' is not known on line 27 in source list /etc/apt/sources.list.d/signal-xenial.list
E: The list of sources could not be read.
Artur Meinild
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mohammed mwaraenye
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    "xenial" is Ubuntu 16.04 which is out of support. – ChanganAuto Jul 19 '21 at 13:33
  • The question does not include Line 27 of the file /etc/apt/sources.list.d/signal-xenial.list, so you are asking us to speculate about the problem. The usual culprit is a user typo. You must edit that line of that file to fix the typo. However, since Ubuntu 16.04 (non-ESM) is no longer receiving security patches, it shouldn't be on any network anyway. So the question seems moot. – user535733 Jul 19 '21 at 13:38
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    I took the liberty of editing the title, since it seemed greatly exaggerated. – Artur Meinild Jul 19 '21 at 13:41

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