that's why I was interested in your wallet and nostr user account  

 Can I help? If you're using the desktop wallet then you have to make sure the app is running. Lightning can only work if the node is online.   

 Oh that would make sense. So my Hub has to be open at all times. 

 Yes, that's how lightning works currently. Nodes have to be able to talk to each other. 
That's why we recommend an always-on device and also offer reliable cloud hosting. 

 I am going to get my Ubuntu setup and install the Hub from Alby 

 cool, let me know how it goes and if you need help.