FYI, I cannot reproduce this with even less memory:
$ iptables --version
iptables v1.6.1
$ free
total used free shared buff/cache available
Mem: 265712 114824 66744 1024 84144 36024
Swap: 0 0 0
$ cat /proc/version_signature
Ubuntu 5.0.0-7.8-generic 5.0.0
$ sudo iptables -S
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
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https://bugs.launchpad.net/bugs/1820114
Title:
iptables v1.6.1: can't initialize iptables table `filter': Memory
allocation problem
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