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I'm using Ubuntu 15.04 after the network upgrade from 14.10.
The wireless connection doesn't work on my Notebook Acer Travelmate 5720G

The cable connection (eg: eth0 interface ) works.

With Ubuntu 14.10 the wifi connection was ok.

Network Manager find successfully all the available wireless networks on start-up, but when i try to connect with one of them, Network-manager ALWAYS display the "connecting..." animated icon and doesn't connect (i can't access to internet and not even to my Access point admin page).
Opening the network-manager menu show the "Disconnect" menu entry (like when you are connected, but you are not connected).

My access point (Digicom Michelangelo wave 150 C) uses wpa2 encryption.
I haven't done no harware modifications (i use the same builtin wireless network card provided by my notebook).

Using the same wireless access point with another notebook (Toshiba
Tecra with Ubuntu 14.10) everything is ok.

I have tryed to disconnect/reconnect the wireless, reinstall the
network-manager.. but with no results.

------ Imortant: -------------------
I have discovered that the "Additional Driver tool" allow to enable/disable an additional driver named "Processor microcode firmware for intel CPU (proprietary)".

I have done a test running a fresh ubuntu 15.04 live cd: i can't connect
to wireless, but enabling the above Intel driver i can connect !

Repeating the same test with the installed ubuntu 15.04 i was able to
connect only a couple of times (i have tryed to enable/disable the
driver after a kernel update from the Ubuntu update manager, but with no
result).

Disabling the Intel driver happen the same situation described above (ie: always "trying to connect")
---------------------------------------

No system crash or other problems are shown.

Here iwconfig output:
wlan0     IEEE 802.11abg  ESSID:off/any
             Mode:Managed  Access Point: Not-Associated   Tx-Power=15 dBm
             Retry short limit:7   RTS thr:off   Fragment thr:off
             Power Management:off

The uname -a output is:
Linux my-pc 3.19.0-22-generic #22-Ubuntu SMP Tue Jun 16 17:14:22 UTC 2015 i686 i686 i686 GNU/Linux

network-manager version installed is:  0.9.10.0-4ubuntu15.1

Before submitting the bug I have installed all the available updates at
15 july 2015 but the problem persist.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: network-manager 0.9.10.0-4ubuntu15.1
ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
Uname: Linux 3.19.0-22-generic i686
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: i386
CurrentDesktop: Unity
Date: Wed Jul 15 23:57:06 2015
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2013-05-26 (780 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
IpRoute:
 default via 192.168.1.254 dev eth0  proto static  metric 1024
 169.254.0.0/16 dev eth0  scope link  metric 1000
 192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.1
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to vivid on 2015-05-14 (62 days ago)
nmcli-con:
 NAME                    UUID                                  TYPE             TIMESTAMP   TIMESTAMP-REAL                 AUTOCONNECT  READONLY  DBUS-PATH                                   ACTIVE  DEVICE  STATE      ACTIVE-PATH
 Connessione via cavo 1  f2f696e8-00df-4547-8669-feac4d6a4c66  802-3-ethernet   1436997193  mer 15 lug 2015 23:53:13 CEST  yes          no        /org/freedesktop/NetworkManager/Settings/1  yes     eth0    activated  /org/freedesktop/NetworkManager/ActiveConnection/3
 horizon_net             dc7a0ebf-ecd9-4341-af77-45b587f8f93e  802-11-wireless  1436735226  dom 12 lug 2015 23:07:06 CEST  yes          no        /org/freedesktop/NetworkManager/Settings/0  no      --      --         --
nmcli-dev:
 DEVICE  TYPE      STATE         DBUS-PATH                                  CONNECTION              CON-UUID                              CON-PATH
 eth0    ethernet  connected     /org/freedesktop/NetworkManager/Devices/1  Connessione via cavo 1  f2f696e8-00df-4547-8669-feac4d6a4c66  /org/freedesktop/NetworkManager/ActiveConnection/3
 wlan0   wifi      disconnected  /org/freedesktop/NetworkManager/Devices/3  --                      --                                    --
 lo      loopback  unmanaged     /org/freedesktop/NetworkManager/Devices/0  --                      --                                    --
 irda0   unknown   unmanaged     /org/freedesktop/NetworkManager/Devices/2  --                      --                                    --
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: apport-bug i386 vivid
-- 
ubuntu 15.04 wireless network driver doesn't connect: always "trying to connect" animation
https://bugs.launchpad.net/bugs/1475042
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