[Bug 1985971] [NEW] Broken domain adminstrator check on ubiquity installer for AD join

[Lantizia]

Public bug reported:

Using the latest Ubuntu MATE 22.04.1 ISO released a couple of days
ago...

See photo.jpg attached...

At the screen 'Configure Active Directory' I enter in a valid 'Domain
Administrator' username... and it thinks it must start with a lower-case
letter and doesn't like the $ dollar sign at the beginning.

Don't ask me why (as I didn't set it up) but at the company where I
work... we have AD accounts specifically for administrator functions and
these are prefixed with a dollar sign.  It does not appear to be (in
anyway) a contravention the rules for naming AD users... so the
validation check on ubiquity must be wrong.

** Affects: ubuntu-mate
     Importance: Undecided
         Status: New

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "photo.jpg - Shows the screen where the validation check fails"
   https://bugs.launchpad.net/bugs/1985971/+attachment/5608166/+files/photo.jpg

** Also affects: ubiquity (Ubuntu)
   Importance: Undecided
       Status: New

** Description changed:

  Using the latest Ubuntu MATE 22.04.1 ISO released a couple of days
  ago...
  
  See photo.jpg attached...
  
  At the screen 'Configure Active Directory' I enter in a valid 'Domain
  Administrator' username... and it thinks it must start with a lower-case
  letter and doesn't like the $ dollar sign at the beginning.
  
  Don't ask me why (as I didn't set it up) but at the company where I
  work... we have AD accounts specifically for administrator functions and
  these are prefixed with a dollar sign.  It does not appear to be (in
  anyway) a contravention the rules for naming AD users... so the
- validation check on ubiquiti must be wrong.
+ validation check on ubiquity must be wrong.

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https://bugs.launchpad.net/bugs/1985971

Title:
  Broken domain adminstrator check on ubiquity installer for AD join

Status in Ubuntu MATE:
  New
Status in ubiquity package in Ubuntu:
  New

Bug description:
  Using the latest Ubuntu MATE 22.04.1 ISO released a couple of days
  ago...

  See photo.jpg attached...

  At the screen 'Configure Active Directory' I enter in a valid 'Domain
  Administrator' username... and it thinks it must start with a lower-
  case letter and doesn't like the $ dollar sign at the beginning.

  Don't ask me why (as I didn't set it up) but at the company where I
  work... we have AD accounts specifically for administrator functions
  and these are prefixed with a dollar sign.  It does not appear to be
  (in anyway) a contravention the rules for naming AD users... so the
  validation check on ubiquity must be wrong.

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