Hi,
My first message on your great board 
I installed discourse on a server with debian 9. Each time I use the command ./launcher, all is working great but I have this message displayed :
cupidon@XXXXXXX:/var/discourse# ./launcher rebuild cupidon
stat: cannot read file system information for ‘extfs’: No such file or directory
./launcher: line 202: /10243 < 5: syntax error: operand expected (error token is "/10243 < 5")
Do you know how to fix this ?
Thanks for your help.