ubuntu managed to disable root login, no matter what is set in /etc/ssh/sshd_config
so all ssh-copy-id root@123.123.123.123 fails
the only possible way to login straight as root (only on test systems!)
is to
1. manually create
mkdir /root/.ssh/
touch /root/.ssh/authorized_keys
2. copy and paste the user’s public key to /root/.ssh/authorized_keys
so basically do manually what ssh-copy-id would do
then try again
ssh root@123.123.123.123
can understand why, to prevent ssh brute force attacks (which are unfortunately very common) damn those canonicals
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