Ive been having this problem for a while now and i've tried most of the things i could find but nothing seems to work.
Err:1 http://uk-mirrors.evowise.com/ubuntu hirsute InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Err:7 http://ppa.launchpad.net/micahflee/ppa/ubuntu hirsute Release
404 Not Found [IP: 91.189.95.85 80]
Err:11 https://ookla.bintray.com/debian generic InRelease
403 Forbidden [IP: 52.40.65.167 443]
Reading package lists... Done
E: Failed to fetch http://uk-mirrors.evowise.com/ubuntu/dists/hirsute/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: The repository 'http://uk-mirrors.evowise.com/ubuntu hirsute-updates InRelease' is no longer signed.
E: Failed to fetch http://uk-mirrors.evowise.com/ubuntu/dists/hirsute-updates/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://uk-mirrors.evowise.com/ubuntu hirsute-backports InRelease' is no longer signed.
E: Failed to fetch http://uk-mirrors.evowise.com/ubuntu/dists/hirsute-backports/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: Failed to fetch http://uk-mirrors.evowise.com/ubuntu/dists/hirsute-security/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: Failed to fetch https://ookla.bintray.com/debian/dists/generic/InRelease 403 Forbidden [IP: 52.40.65.167 443]