Cannot make VLANS work after hours of searching

Hi,

normally i dont make post, im use to spending a long time researching and getting the satisfaction of finding the answer myself.
Im sure im probably already come across the answer but im unable to make it work in my lab environment.
after hours and hours (probably over 20) of looking for the answer and testing things. i've decided to make a post (sorry).

im trying to ping my ubuntu server VM from my desktop pc
the ubuntu server is on 172.16.100.3/24 - vlan 100 (default gw 172.16.1.1)...

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