I am having the same issue on my freshly updated 18.04 Ubuntu, but I
could find the following (temporary) workaround:

1. Invoke the gnome command window by pressing Alt+F2
2. Enter `r` (without leading and trailing ` character)
3. Hit enter

Hope this helps :-)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1799293

Title:
  Locking the screen once leaves screen contents visible but not
  interactive. Locking the screen a second time works.

Status in gnome-shell package in Ubuntu:
  Invalid
Status in gnome-shell-extension-dashtodock package in Ubuntu:
  Fix Released
Status in gnome-shell source package in Bionic:
  Invalid
Status in gnome-shell-extension-dashtodock source package in Bionic:
  In Progress
Status in gnome-shell source package in Cosmic:
  Invalid
Status in gnome-shell-extension-dashtodock source package in Cosmic:
  In Progress
Status in gnome-shell source package in Disco:
  Invalid
Status in gnome-shell-extension-dashtodock source package in Disco:
  Fix Released

Bug description:
  1) Ubuntu 18.10 (new install)
  2) gdm3 3.30.1-1ubuntu5

  Preconditions
  The session's user has auto-login enabled (i.e. the system starts and the 
user is not prompted for a password but directly presented with the desktop)

  3) What should happen:
  Unlocked desktop is showing. Lock screen is invoked (via WIN+L or via top 
right corner menu) and the lock screen is engaged (that is, lock screen clock 
shade drops down and screen fades to dark). Pressing ENTER brings back the lock 
screen and the password is prompted.

  4) What happens:
  First Win + L lets the system in a half locked state in which the contents of 
the desktop are seen although no interaction is possible. A second Win + L 
correctly invokes the lock screen.

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