After a recent update to unity (I'm on 14.04 now), when I switch users, after entering my password, I see the screen, and then the screensaver kicks in and asks for my password again... that essentially means after switching users, I need to enter my password twice...
1)
alex@thinkpad:~$ lsb_release -rd
Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04
2)
alex@thinkpad:~$ apt-cache policy unity
unity:
Installed: 7.1.2+14.04.20140318-0ubuntu1
Candidate: 7.1.2+14.04.20140320.1-0ubuntu1
Version table:
7.1.2+14.04.20140320.1-0ubuntu1 0
500 http://tw.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
*** 7.1.2+14.04.20140318-0ubuntu1 0
100 /var/lib/dpkg/status
3) after typing my password when switching users, I get access to the users' desktop
4) I get prompted for the password again after 2-3s
---
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.04
InstallationDate: Installed on 2013-03-19 (369 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130318)
Package: unity 7.1.2+14.04.20140318-0ubuntu1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
Tags: trusty
Uname: Linux 3.13.0-18-generic x86_64
UpgradeStatus: Upgraded to trusty on 2014-03-04 (19 days ago)
UserGroups: adm cdrom dialout dip kismet libvirtd lp lpadmin plugdev sambashare sudo
_MarkForUpload: True
apport information