Wenn Du noch kein Keypair erstellt hast …

bach@hp:~$ cat .ssh
cat: .ssh: Datei oder Verzeichnis nicht gefunden

kannst Du mittels „ssh-keygen“ ein Schlüsselprchen erstellen:

bach@hp:~$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/home/bach/.ssh/id_rsa): 
Created directory '/home/bach/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/bach/.ssh/id_rsa.
Your public key has been saved in /home/bach/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:ORDHbfp/Vb+aoPVMVjPhlpUv1RLoIRbwQn0Or4 bach@hp
The key's randomart image is:
+---[RSA 2048]----+
|    o+=o+      o.|
|     oo* +    ...|
|     ..= o + oo++|
|     o. S * ooooo|
|    . .. + =.o. .|
|     .  . . +o.  |
|      .  . .. o. |
|     E       ..o.|
+----[SHA256]-----+

Den Publich key anzeigen (und auf den Server kopieren) :

bach@hp:~$ cat .ssh/id_rsa.pub 
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQClndRM5ucVeDPsja41GMKPFepZDD3Ugz3Msx3FK4hdgoa8K6Egh0FiZ0GogCni95ZWYBCRU44YIReZPiTbtGXMdPPJ5qMIa8AEnvuthYgwev3ZYU9XJ0W0PCjtSrIxhn62ynUht5NQ3qvgLy/twDMoLEgYuyTLiNbyM8xXc1wcWkIfKLt3WjH3Dkp4BeEGiMcqld49fxEVmUhcufIY0N00aqOq27MEkzPfjWAbukFAhSVjrjWbWFO3RgNoW2eu9/7yavYs3SToq0S5VguywivZTbfWF7jKSTUQwEnkiuoIJYPRjHwxnhJY1voEkj3Q9li+1ubZggmoJ+CiGq+zQ9 bach@hp

Dann kannst Du Dich direkt mit key einloggen:

bach@hp:~$ ssh -l lug arche.uberspace.de
The authenticity of host 'arche.uberspace.de (185.26.156.147)' can't be established.
ED25519 key fingerprint is SHA256:Er1gFeWDUyR2SwmfYd/cB/K/h2ibMI+QtChVPnFYM.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'arche.uberspace.de,185.26.156.147' (ED25519) to the list of known hosts.
Enter passphrase for key '/home/bach/.ssh/id_rsa': 
Last failed login: Fri Mar  5 17:04:55 CET 2021 from 2a02:8109:43f:10a8:6cf1:3aa4:cde2:7da2 on ssh:notty
There were 6 failed login attempts since the last successful login.
Last login: Fri Mar  5 16:55:37 2021 from 31.150.9.137
Welcome to Uberspace 7!

Current version: 7.9.0.0
Manual: https://manual.uberspace.de/en/                                                                                                                                       
Watch out for changes at: https://manual.uberspace.de/en/changelog.html                                                                                                       
Follow us on Twitter for updates: https://twitter.com/ubernauten                                                                                                              
                                                                                                                                                                              
Is something unclear or does not work as expected?                                                                                                                            
 => check the server status: https://is.uberspace.online                                                                                                                      
 => reach out to our team: hallo@uberspace.de                                                                                                                                 
[lug@arche ~]$                       

Installieren:

bach@hp:~$ sudo apt install filezilla

Konfigurieren: