Hi - am unable to update my Pi-Top Polaris OS software due to repository access issue - see following
pi@pi-top:~ $ sudo apt-get update
Err:4 https://apt.pi-top.com/pi-top-os stretch Release
Reading package lists… Done
E: The repository ‘https://apt.pi-top.com/pi-top-os stretch 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.
any advice welcomed - thanks