Display issue on after upgrade from Dolibarr 6.0.4

Greetings everyone,
After upgrading from version 3.7.1 up to 6.0.4, following all intermediate upgrade steps.
After finishing, I manage to logon into the system but the layout is completely messed up, and even after changing the theme it still the same.
Does anyone experienced a similar problem? Any ideas on how to resolve this issue?
Thanks in advance.

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