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+###How to add SSH key to server   
+After setting up first remote ssh connection type from your PC (not server)  
+  
+scp C:\Users\User.ssh*.pub user@hostname:/home/user/  
+(example: C:\Users\user*\.ssh\id_ed25519.pub user@ip_address_of_the_host:/home/)  
+Then enter password, after that >  
+Go to your server and add your key, to ssh_authorized keys >  
+cat id_ed*.pub >> ~/.ssh/authorized_keys  
+And don't forget to restart ssh and sshd