When I was installing the Ruby on Rails appliance, I told it to update the security. After a awhile, it timed out.
I could be mistaken in what I copied from the screen.
Later in a webshell, I enter cronapt but the command was not found.
Based on the log file entry, I typed cron-apt which seems to work.
On the off chance that I did copy the message correctly and you have a typo in your instructions, I am letting you know.
If the error is my part because I cannot read, sorry for the intrusion.