after each reboot I need to assign swap manually and /etc/rc.local doesn't get triggered

Question

After every reboot, I'm just seeing one swap in my system.

$ sudo swapon --show
NAME      TYPE SIZE USED PRIO
/swapfile file   2G   0B   -2

So in /etc/rc.local I've put this piece of instruction:

# activate two secondary swap of size 16GiB + 16GiB
sudo swapon /swapfile1
sudo swapon /swapfilesecondary

Still after restarting I get only one swap with 2 GiB of memory. How can I fix this?

NB: If I manually execute these two commands, then I get the desired output:

$ sudo swapon --show
NAME               TYPE SIZE USED PRIO
/swapfile          file   2G   0B   -2
/swapfile1         file  16G   0B   -3
/swapfilesecondary file  16G   0B   -4