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passwordless SSH

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Operating System: Debian GNU/Linux 10
KDE Plasma Version: 5.14.5
Qt Version: 5.11.3
KDE Frameworks Version: 5.54.0
Kernel Version: 4.19.0-16-amd64
OS Type: 64-bit
Processors: 4 × AMD FX(tm)-4350 Quad-Core Processor
Memory: 15.6 GiB of RAM

I have been trying to setup passwordless SSH for a Backuppc system. I 
have three Debian 10  systems (including the server) . SSH sets up fine 
on one of the client machine and "ssh backuppc@192.168.254.xx starts 
without asking for a password. The other machine (supposedly identical) 
not only asks for a password but will not accept any of the known 
passwords.  If I go to the offending machine and attempt to su to the 
backuppc user , I am asked for a password and no passwords work. This 
doesn't allow the use of ssh-copy-id for transfering the encryption key 
to that machine. I have tried to reset the backuppc password three times 
but did not solve the problem. In both systems the public key is stored 
in /var/lib/backuppc/.ssh as id_rsa.pub.

I also have a Windoz 7 laptop that I want to include and have managed to 
get ssh and rsync installed (what a mess that was). I have not tried to 
get passwordless access to that yet. For later.

Any insights?

Gary R.

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passwordless SSH "Gary L. Roach" <garyroach719@gmail.com> - 2021-05-29 22:20 +0200
  Re: passwordless SSH Bob Weber <bob2969685@gmail.com> - 2021-05-30 00:50 +0200
    Re: passwordless SSH David Wright <deblis@lionunicorn.co.uk> - 2021-06-03 23:20 +0200
      Re: passwordless SSH Frank Pikelner <frank.pikelner@gmail.com> - 2021-06-03 23:30 +0200
        Re: passwordless SSH David Wright <deblis@lionunicorn.co.uk> - 2021-06-04 04:30 +0200

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