Example cannot pingall after enough long time

[UnicornJin]

Hi, I tested the example on Ubuntu20.04 with 4GB RAM and 4 core CPU.

However, in frrouters example, the pingall doesn't work: (5-min later after start, still not work)

May I check is this because of performance or there's bug in this repo?
I set up with the requirement bash script, and followed the installation.
(I guess maybe because the script is not compatible with the latest ubuntu system, maybe you want to update this repo?)