Possible to install package during or after installation step?

[Phondanai Khanti]

I have some .deb packages need to install in system.
I try to do this by putting package somewhere in system and use preseed to
tell ubiquity to install package with line

d-i preseed/late_command string dpkg -i /path/to/file.deb

It doesn't work for me.

How can I install my package or execute command during installation or
almost installation finnish.

Thank you very much.
--
Phondanai Khanti
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