revision 34af793b6c4f25a0622122e9b30d482d2d271758
Even on Debian 12 (bookwork) we need to use "jessie" in the source list file.
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deb [signed-by=/etc/apt/keyrings/slacktechnologies_slack-archive-keyring.gpg] https://packagecloud.io/slacktechnologies/slack/debian jessie main