22.04.5 LTS (Jammy Jellyfish)
#apt update
Get:1 http://dl.bluecherrydvr.com jammy InRelease [10.3 kB]
**Err:1 http://dl.bluecherrydvr.com jammy InRelease**
** Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)**
Hit:3 http://ru.archive.ubuntu.com/ubuntu jammy-updates InRelease
Hit:4 http://ru.archive.ubuntu.com/ubuntu jammy-backports InRelease
Hit:5 http://ru.archive.ubuntu.com/ubuntu jammy-security InRelease
Hit:6 https://download.docker.com/linux/ubuntu jammy InRelease
Hit:7 https://ppa.launchpadcontent.net/ondrej/php/ubuntu jammy InRelease
Reading package lists... Done
E: Failed to fetch http://dl.bluecherrydvr.com/dists/jammy/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: The repository 'http://dl.bluecherrydvr.com jammy InRelease' is not signed.
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.