I'm seeing this same thing with an Eduroam wifi, it used to work in
until 12.10 but now in 13.04 it always asks me for the password when
booting. I have tried everything available for similar problems and I
cannot get it to work.

I stumbled upon this configuration file, which goes in
/etc/NetworkManager/system-connections/eduroam:

[ipv6]
method=auto
ip6-privacy=2

[connection]
id=eduroam
uuid=2fb6ac81-bb1c-44df-ba87-f0ec95e3d0d1
type=802-11-wireless
timestamp=1349875620

[802-11-wireless]
ssid=eduroam
mode=infrastructure
security=802-11-wireless-security

[802-1x]
eap=ttls;
identity=<change this>@studserv.uni-leipzig.de
phase2-auth=pap
password=<change this>

[ipv4]
method=auto

[802-11-wireless-security]
key-mgmt=wpa-eap

Mine was almost identical, but did not have the line which starts with
"password". After introducing this line (and deleting two other lines
that appeared in my configuration file but not here) now after rebooting
"eduroam" does not ask for a password any more.

So it seems that the bug is that after editing the connection in the
NetworkManager GUI this password line is not saved in the system
configuration file, if I understand correctly how nm works.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1175090

Title:
  WPA2 Enterprise network passwords don't save for LightDM sessions.

Status in “lightdm” package in Ubuntu:
  Confirmed

Bug description:
  My university campus uses the Eduroam (https://www.eduroam.org)
  standard for its Wi-Fi access points. I have saved my authentication
  details for this access point using Ubuntu 13.04's standard network
  manager and it connects automatically as such after a return from
  suspend. When booting the machine and getting to LightDM, however, I
  am prompted to enter my password for the Eduroam access point. This
  should authenticate automatically, as I have saved the password, as it
  did in Ubuntu 12.04 and 12.10.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: lightdm 1.6.0-0ubuntu2.1
  ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
  Uname: Linux 3.8.0-19-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  Date: Wed May  1 09:23:47 2013
  InstallationDate: Installed on 2013-04-25 (5 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  LightdmConfig:
   [SeatDefaults]
   user-session=ubuntu
   greeter-session=unity-greeter
  MarkForUpload: True
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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