username is definitely not in use, but linphone thinks it is

[themusicgod1]

1) SIP assistant window opens automatically on first launch

2) click forward

3) create account on linphone.org

4) enter email

5) enter username.
It doesn't matter how long or complicated, as long as you type enough to no longer the the "Username is too short"...the error message given is : "Username is already in use!". Even if you type in an absurdly long and complicated username that it's almost impossible someone would have picked before.

The next button remains greyed out as long as there is an error.

If this *is* a linphone.org issue, then the error message should indicate that.
If it *isn't* then signups via this wizard are effectively broken because of the client

either way this is a bug.

Ubuntu: 15.10

linphone:
  Installed: 3.6.1-2.4build2
  Candidate: 3.6.1-2.4build2

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linphone 3.6.1-2.4build2
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Feb 26 17:49:11 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-07-09 (597 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140708)
SourcePackage: linphone
UpgradeStatus: No upgrade log present (probably fresh install)

[themusicgod1 (themusicgod1)]

not reproducible in xenial/16.04

[oymiami (oren-i)]

Certainly able to reproduce on Ubuntu 16.04.2
Linphone does not save the new SIP account, regardless if you add a Proxy or not (even though it is not required).