I spent several minutes to prepare sew screenshots and describe my problem - and finally I got this error:

> Oops! Your question couldn't be submitted because:
> 
> We're sorry, but as a spam prevention mechanism, new users aren't
> allowed to post images. Earn more than 10 reputation to post images.
> sorry, the 'ubuntu' tag is not allowed. users with less than 300
> reputation can't create new tags. The tag 'ubuntu' is new. Try using
> an existing tag

Could you show this message on the beginning to prevent wasting time.