| I just received this error upon an 'apt update' command. I switched to the debian.tu-bs.de repository to work around it. 
 
       Code: 
Err:79 http://aptosid.office-vienna.at/aptosid/debian sid Release                                                                                           
Unable to connect to aptosid.office-vienna.at:http:
 
 ...
 Reading package lists... Done
 E: The repository 'http://aptosid.office-vienna.at/aptosid/debian sid Release' does no longer have a Release file.
 N: Updating from such a repository can't be done securely, and is therefore disabled by default.
 N: See apt-secure(8) manpage for repository creation and user configuration details.
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