Although the update should have been applied automatically, make sure your system is completely up to date with:
| No Format |
|---|
sudo apt update && sudo apt upgrade |
You may check the version of OpenSSH with:
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$ dpkg -l openssh-server
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-===================-============-=================================================================
ii openssh-server 1:8.9p1-3ubuntu0.10 amd64 secure shell (SSH) server, for secure access from remote machines |
It must be 8.9p1-3ubuntu0.10 or above.