Shouldn't be relevant since you could use it before but it might be worth checking out.
Vladimir E. Rodriguez wrote:
Sometime ago it was working normal without problems. After that I changed the root password, always that I want to change something in the configuration of the system, I run su from other user (vladimir).
But the system says 'invalid password'. I tried the old, and new password, but it doesn't work
I have to logout, and login with root to change some configurations.
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