Ubuntu apt update errors

Hi all

I’m having troubles to upgrade my linux dist when i run the command apt update on ownloud

the error is
Failed to fetch http://download.owncloud.org/download/repositories/9.1/Ubuntu_17.04/Packages gnutls_handshake() failed: Handshake failed
My ubuntu version is

NAME=“Ubuntu”
VERSION=“14.04.5 LTS, Trusty Tahr”
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME=“Ubuntu 14.04.5 LTS”
VERSION_ID=“14.04”

Neither Ubuntu 14.04 nor 17.04 are supported. Please upgrade (to at least 18.04 - better 20.04).

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