Quote From : InWebServices April 23, 2012, 7:55 am
For reference, if you use the setting to generate database name automatically and the database name is less than 5 characters, it causes the install to fail due to there being a 5 character minimum for the username. This appears to be a bug in softaculous, the error message is obviously not the most helpful.
We have tested this on our servers and even the username with less than 5 characters are created.
Which panel are you using ?
If it is H-Sphere then you must have set some custom settings which does not allow to create username with less than 5 characters.
If you can open a support ticket with a test account details we will check the issue.
Also regarding the error message we will improve it.
Review us at cPanel