do i perform step 5 in isolation, or do i need to do the previous steps again?
It looks like you missed out “stage 5”, but I would go through the whole thing and check.
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In this topic, I think the real issue was the deprecated plugin. I probably won’t go through DigitalOcean’s procedure, but someone else can. 
rebuilding without swap is not pleasant and risky.
even with 8GB of RAM
but then again, there will now be a lot more plugins i don’t need in core
you will likely get away with it, but it’s good practice to have some “run-off”
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i ran cp /etc/fstab /etc/fstab.bak but still
root@ubuntu:~# free -h
total used free shared buff/cache available
Mem: 7.7Gi 1.8Gi 5.0Gi 83Mi 964Mi 5.6Gi
Swap: 0B 0B 0B
after reboot
those are the lines that make the swap persist between boots.
the first adds it to /etc/fstab, the last makes the swappiness get sset at every boot.
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the single-session output on running your lines is
Last login: Wed Jul 23 13:16:35 2025
root@ubuntu:~# echo "/swapfile swap swap auto 0 0" | tee -a /etc/fstab
/swapfile swap swap auto 0 0
root@ubuntu:~# sysctl -w vm.swappiness=10
vm.swappiness = 10
root@ubuntu:~# echo 'vm.swappiness = 10' > /etc/sysctl.d/30-discourse-swap.conf
root@ubuntu:~# free -h
total used free shared buff/cache available
Mem: 7.7Gi 3.0Gi 389Mi 671Mi 4.3Gi 3.7Gi
Swap: 0B 0B 0B
root@ubuntu:~#
i then ran reboot in a VNC, and free -h returned the desired 2GB of Swap space
Got snagged by this. Did not expect the backup to fail. Thanks for this topic and the plugin one.
A tweak to communications via ADMIN would be good or at least a check on the ./launcher rebuild app execution, with stop output with a y/n break in terminal continue.
Eventually had to remove the discotoc plugin to get it to work here but not sure that was listed in the plugin that are now core.
Really appreciate that, thanks! I’ve been learning as I go too — glad some of my posts have helped others along the way.