[Samba] Conversion error: Incomplete multibyte sequence

[KONFERENCE]

Hello,

I tried the migration from samba 3 to a sernet-samba-ad-4.1.9-8.
My samba 3 has tdbsam backend, and "Full Name" (pdbedit -Lv) contains umlauts.

If I run /usr/bin/samba-tool domain classicupgrade, I will see error:
"Conversion error: Incomplete multibyte sequence"

I had in my old smb.conf:
display charset = iso8859-2
dos charset = cp852
unix charset = iso8859-2

In i18n:
LANG="cs_CZ"
SUPPORTED="cs_CZ:cs:en_US:en"
SYSFONT="lat2-sun16"
SYSFONTACM="iso02"


I am thinking probable cause is encode file passdb.tdb

Could you please solution to this?

Thank you,

Honza