Assuming so, my guess is that it's a permissions issue. It sounds like you moved the directory as the root (or admin) user. So when you moved it back, it's probably now owned by root, so the 'tomcat' user can't access it. So you'll need to change the ownership of that directory back to 'tomcat'.
If you're a Webmin user, then unfortunately, I'm not very familiar with that, so hopefully you can work out how to change ownership or permissions (the whole folder and all the files need to be owned by 'tomcot'). Or you can do it from the commandline:
chown -R tomcat:tomcat /PATH/TO/webapp/manager
(Where '/PATH/TO/webapp/manager' is the actual real path to the 'manager' folder).
I hope that helps. If you continue to have issues, please post back and I'll fire a Tomcat server up and have a look.
Hi Kate
Firstly when you say "Tomcat 9 under Ubuntu 16" I assume you mean the TurnKey Linux v16.x Tomcat standalone appliance?
Assuming so, my guess is that it's a permissions issue. It sounds like you moved the directory as the root (or admin) user. So when you moved it back, it's probably now owned by root, so the 'tomcat' user can't access it. So you'll need to change the ownership of that directory back to 'tomcat'.
If you're a Webmin user, then unfortunately, I'm not very familiar with that, so hopefully you can work out how to change ownership or permissions (the whole folder and all the files need to be owned by 'tomcot'). Or you can do it from the commandline:
(Where '/PATH/TO/webapp/manager' is the actual real path to the 'manager' folder).
I hope that helps. If you continue to have issues, please post back and I'll fire a Tomcat server up and have a look.