Non-EU nationals entering Lithuania must register via the EES. Don’t worry the procedure is very easy!
European Union website:

Non-EU nationals entering Lithuania must register via the EES. How are you arriving?
What is the Entry / Exit System?
The Entry / Exit System (EES) is a system created by the European Union (EU) for non-EU nationals. The system digitally checks your identity.
It was implemented to improve border control and make border crossing procedures faster.
Robotic identification and registration system
ROBARS stands for Robotic Optoelectronic Biometric / Alphanumeric Registration System.
It digitally checks your identity and makes your registration process fast & easy. There are two ways to register via the Self-service terminals or the Universal Registration System.
Universal Registration System
Self-service Terminal
ARE YOU AN EU CITIZEN?
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