Incorrect password -root -

every time I try to install an app I got the " incorrect password" message, the password is correct though. any clue?

Your account could be locked for failures (resulting in all future attempts failing till it times out).
I’ve seen components that are out of sync and require a reboot causing this as well.
Maybe a keyboard language mismatch as well.
That’s all I can think of…barring like hardware failures.

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Thanks, actually it’s keyboard mismatch, I, I’ll wait and see.

There is no root passwd set as default. You need to set it with sudo.

sudo su
then

passwd

Thanks, proplem solved.