ubuntu-system-zram

apt-get -uy install zram-config nohang; service zram-config start
# alternatively go with debian-system-zram (also works on Ubuntu)
# also read:
# https://docs.kernel.org/admin-guide/blockdev/zram.html
# https://unix.stackexchange.com/questions/594817/why-does-zram-occupy-much-more-memory-compared-to-its-compressed-value
# https://lore.kernel.org/lkml/20160606194836.3624-2-hannes@cmpxchg.org/
# https://unix.stackexchange.com/questions/32333/what-does-the-vm-swappiness-parameter-really-control