I have the same Problem and I found a similar Bug #1044251
(https://bugs.launchpad.net/bugs/1044251) solved in 2012
For me, enabling the 'Manual Login'' and replacing unity works so far.
This is just an (ugly) workaround (Loginpromt changes), but some parts of the
old fix might be applied here as well?
I applied the following steps:
1. Switch to tty1 ( [Ctrl]+[Alt]+[F1] ) and login
2. edit the appropriate lightdm configuration, in my case:
sudo vim /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf
3. set/add th following property
greeter-show-manual-login=true
To be able to continue work w/o restarting lightdm (loosing all running
processes / open windows), one can simply replace unity (see also
accepted answer in http://superuser.com/questions/570194/how-
do-i-restart-a-frozen-screen-in-ubuntu-without-losing-any-open-windows )
4. set and export the DISPLAY variable:
DISPLAY=:0
export DISPLAY
5. run (re-)unity (--replace might not be neccessary):
unity --replace
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https://bugs.launchpad.net/bugs/1311316
Title:
After locking screen there is no input field to type password for
unlock
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