E: The repository ‘http://download.owncloud.org/download/repositories/10.0/Ubuntu_18.04 Release’ no longer has 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.
You should be able to just remove the repo, as I recommend against upgrading using the package manager.
root@331a6b8ec924:/~grep -r “download.owncloud”/etc/apt* /etc/apt/sources.list.d/owncloud.list:deb download.owncloud.org/download/repositories/production/Ubuntu_19.10// # Edit or remove the file root@331a6b8ec924:/~nano /etc/apt/sources.list.d/owncloud.list #comment out the line [or]root@331a6b8ec924:/~rm /etc/apt/sources.list.d/owncloud.list root@331a6b8ec924:/~apt-get update
Ref:https://central.owncloud.org/t/apt-get-update-no-longer-works-due-to-owncloud-changes/24505/2
Ref:https://askubuntu.com/questions/1141671/cant-update-securely-and-is-therefore-disabled
You should be able to just remove the repo, as I recommend against upgrading using the package manager.
root@331a6b8ec924:/~grep -r “download.owncloud”/etc/apt* /etc/apt/sources.list.d/owncloud.list:deb download.owncloud.org/download/repositories/production/Ubuntu_19.10// # Edit or remove the file root@331a6b8ec924:/~nano /etc/apt/sources.list.d/owncloud.list #comment out the line [or]root@331a6b8ec924:/~rm /etc/apt/sources.list.d/owncloud.list root@331a6b8ec924:/~apt-get update
Ref:https://central.owncloud.org/t/apt-get-update-no-longer-works-due-to-owncloud-changes/24505/2
Ref:https://askubuntu.com/questions/1141671/cant-update-securely-and-is-therefore-disabled