I did further investigation。 The reason is that, when using
Nvdia-340.104 driver, I am not able to type any UPPERCASE letters using
the CapsLk key. I discovered this when I click the "Not listed?" link
and then type letters in the username input field. All appercase letters
are accepted as
** Changed in: gdm3 (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1750336
Title:
Unable to login when using Nvdia-340.104 driver ("password is
incorrect"