1

Topic: Installtion Error

W: GPG error: https://packages.inverse.ca/SOGo/nightly/4/debian stretch InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 19CDA6A9810273C4
W: The repository 'https://packages.inverse.ca/SOGo/nightly/4/debian stretch InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

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2

Re: Installtion Error

Seems an issue of the SOGo apt repo. Might be temporary issue, i suggest try again later.