Hi. I have been researching lately and I've come to the conclusion that I prefer XMPP over Telegram(my current main IM app). I thought it'd be easy to use XMPP on my Nokia N900, since it's an old service that was even more popular back at its time, but I have a few problems. Number one, Pidgin doesn't let me log in. I've checked everything, even logged in from Pidgin on my PC, and it works there, but not on my N900. It says "SSL Handshake Failed" and I've found no way around that.
Number two, I want XMPP to have OMEMO encryption. I know that 99% sure there won't be any XMPP clients in Maemo supporting this. But just asking, are there any?
And number three, I've tried installing Dino Instant Messenger from X Terminal, using sudo apt install dino-im, but it asks me for a password I have never set. If I write sudo gainroot then sudo apt install dino-im, it says "user is not in the sudoers file. This incident will be reported.". And if I omit the sudo part of the command(that is, if I only type [HTML]apt install dino-im) then it says "-sh: apt: not found". How can I install Dino IM?

So to sum up, three questions: 1. How do I get around the SSL Handshake Failed error in Pidgin? 2. Is there any client in Maemo 5 that allows for OMEMO encryption? and 3. How can I install Dino IM on my Nokia N900(if it is possible)?
Thanks in advance.