Greetings,i would like to reinstall my Ubuntu Mate 19.04 but i have a lot of important data so i wouldnt like to wipe it(if possible to keep apps).Could you help me?
Im able to boot system up but not able to use sudo or su command.
use a memory stick and copy your data to there before reinstalling your operating system. you will have to reinstall your apps after you have reinstalled.
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I think if you just boot up the live medium and choose to install, when you get to the "install alongside or replace" screen there will be a "Reinstall Ubuntu MATE 19.04 and keep your files" or something along those lines. You would obviously want a backup anyway, but it might be worth a shot.
you must have a separate HOME partition first, google can help.
and re install your pc/laptop with OTHER option and select your HOME partition.
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sadly,i havent seen that menu, i think it doesnt exist in ubunt mate installer
I hadn't either until the 19.04 release, but I saw it in Ubuntu MATE and plain Ubuntu.
yes it is.. at the bottom of the selections.. I mean CHOOSE SOMETHING ELSE.
you must have a separate home partition first(google it). I have 5 partitions. sda1 for EFI, sda2 for BOOT, sda3 for ROOT, sda4 for SWAP and sda5 for HOME. I can upgrade/downgrade without losing my personal data 
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Hello Stefan_J
You may find this now "classic" post by Wolfman to be helpful:
I hope that helps you understand some of the things talked about in the posts prior to this one a little better. 
I finally did a complete reinstall of 18.04LTS using the "Something else" feature when I replaced my spinning rust with an SSD. I viewed a YouTube video made by Joe Collins https://www.youtube.com/watch?v=DwqP_4vlOP4 as my guide. My /home directory is in it's own partition now. Works as it should.