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When i execute apt get-update i encounter this error, hoping someone can help me please. Thanks!

root@eve-ng:~# apt get-update
E: Invalid operation get-update
root@eve-ng:~# apt update
Hit:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:4 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease
Err:2 http://www.eve-ng.net/repo xenial InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Fetched 96.0 kB in 3s (27.9 kB/s)
Reading package lists... Done
E: Failed to fetch http://www.eve-ng.net/repo/dists/xenial/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: Some index files failed to download. They have been ignored, or old ones used instead.
root@eve-ng:

The same problem

you are trying updgrade deprecated version xenial ubuntu 16 based

if you want get new eve community 5 do backup and install fresh new eve v5