Plesk is installed on Debian 9 or Ubuntu 18.04:
# plesk -v | grep 'OS version'
OS version: Debian 9.12 x86_64
Support SSH Access Extension requires installation of
sudocommand but it fails with the following error in Extensions > Support SSH Access Extension:
Another installation is currently in progress
In order to proceed, package "sudo" must be installed on the server.
There are no Plesk Installer, dpkg or apt processes running on the server:
# ps auxfww | less | grep installer
root 23279 0.0 0.0 12716 952 pts/0 S+ 11:32 0:00 _ grep installer
# ps auxfww | less | grep dpkg
root 23279 0.0 0.0 12716 952 pts/0 S+ 11:32 0:00 _ grep dpkg
# ps auxfww | less | grep apt
root 23279 0.0 0.0 12716 952 pts/0 S+ 11:32 0:00 _ grep apt
Bug with ID EXTCERT-2781 in Support SSH Access Extension installation.
Login server via SSH;
Run the following command to install
# apt install sudo -y && rm /usr/local/psa/var/modules/support-access/*