This causes the long boot:

Abr 23 22:09:32 username-ub systemd[1]: Job 
dev-disk-by\x2duuid-b45aa035\x2da236\x2d4471\x2da1d2\x2dfbdf7ae4160b.device/start
 timed out.
Abr 23 22:09:32 username-ub systemd[1]: Timed out waiting for device 
dev-disk-by\x2duuid-b45aa035\x2da236\x2d4471\x2da1d2\x2dfbdf7ae4160b.device.
Abr 23 22:09:32 username-ub systemd[1]: Dependency failed for 
/dev/disk/by-uuid/b45aa035-a236-4471-a1d2-fbdf7ae4160b.
Abr 23 22:09:32 username-ub systemd[1]: Dependency failed for Swap.

presumably you have a swap device in /etc/fstab which does not actually
exist any more. Can you please copy&paste the output of

   cat /etc/fstab
   sudo blkid

?

Then there are dozens of error messages like
Abr 23 22:09:37 username-ub wpa_supplicant[884]: Failed to initialize control 
interface '/var/run/wpa_supplicant'.
                                                You may have another 
wpa_supplicant process already running or the file was
                                                left by an unclean termination 
of wpa_supplicant in which case you will need
                                                to manually remove this file 
before starting wpa_supplicant again.
Abr 23 22:09:37 username-ub NetworkManager[765]: <error> [1429837777.078459] 
[supplicant-manager/nm-supplicant-interface.c:856] interface_add_cb(): (wlan0): 
error adding interface: wpa_supplicant couldn't grab this interface.

Can you please give the output of

  ls -ld /var/run /run
  mount | grep /run

Thanks!

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https://bugs.launchpad.net/bugs/1447864

Title:
  AR9462 wifi won't work after upgrade to vivid

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