Symptoms: When you input the Appeon product key during installing Appeon Server on Ubuntu, you may get an error saying "The product key [XXXX] you specified is not valid" as shown below.


Cause: It is caused by the "-e" before every line. Appeon takes it as a part of the Appeon product key.

Solution: Remove "-e" before every line by using '.' or 'source' to run