Running UPDD command line utility (upddutils) and various other commands (e.g upddprocesses) require that the current user has permission to access folder /usr/local/bin.
A few users reported that the command was not found i.e. in a terminal it would be seen as 'upddutils: command not found'
It was discovered that the folder was owned by a non-existent user account and could not be accessed by regular user accounts.
This issue was fixed by executing the following commands in Terminal:
sudo chmod 755 /usr/local/
sudo chmod -R 755 /usr/local/bin/
It should ask for your admin password after the first command.