myVesta

If you want to keep only latest copy of backup on FTP server (to save remote space), in SSH as root run:

Looks like you grabbed
http://vestacp.com/pub/vst-install.sh
instead of
http://c.myvestacp.com/vst-install-debian.sh

You just need to run:

wait, you are using myVesta on Ubuntu?

Received.
I will check.

i sent you private message, can you reply there?

Can you send me URL of your site on private message?

Can't promise anything.
There are a lot of stuff that should be implemented.
Since I'm the only developer of myVesta fork, I just can be honest to you and say that some stuff will be implented in next 1-2-3 years, and some stuff maybe never

that means that you are trying to check page that MAKES redirection, so it's not final address.
maybe you are trying http:// and then he tries to redirect to https://, or something like that.

so, instead of that address (that is doing redirection), please check the FINAL address.

What https://www.giftofspeed.com/gzip-test/ says?

Yes, as I suspected.

Try to unlock it by following this: https://itsfoss.com/could-not-get-lock-error/