The error you're seeing is due to a missing GPG key for the Spotify
repository, which is preventing Ubuntu from verifying the repository's
authenticity. This can be resolved by manually adding the Spotify
repository's GPG key.
Here's how to fix it:
1. Open a terminal.
2. Enter the following comma
This is fix in version 17.10.22 of the Ubuntu MATE Welcome snap.
** Changed in: ubuntu-mate-welcome (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1733196
T
** Tags added: artful
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https://bugs.launchpad.net/bugs/1733196
Title:
Boutique Install Spotify has key error
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** Also affects: ubuntu-mate-welcome (Ubuntu)
Importance: Undecided
Status: New
** Changed in: ubuntu-mate
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1733196