OpenWRT does not use liblzma or systemd so i think that one is pretty safe. I would also be surprised if Android included OpenSSH server binaries in that way.

If you want to be super exact about it it would be roughly 4 times the mass of limescale + mass of already dissolved CaCO₃ in your tap water (you can look that up if you know the hardness index of your water).

But really just don’t be stingy with citric acid and it will be fine is what i am saying.

Here is the math:

Note that citric acid works a bit more nuanced than many other descalers: it acts as a chelating agent at high concentrations (2x the Ca2+ concentration) and is more effective at removing scale because of this effect, but at lower concentrations the effect might actually be reversed because it can form solid calcium citrate, which has a very low solubility in water.

If you are using citric acid based descaler you should make sure that you are always using enough of it to avoid the formation of calcium citrate.

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instead of putting a grub config in /boot/grub you could also try embedding it directly with grub-mkimage. you would need to point to the grub config that you have with -c and add all the needed modules as extra arguments at the end.

it is possible that the grub image you installed is just not looking for the config file at the right place.

or maybe try putting the grub.cfg in the same directory as the grubx64.efi

no i was just adding that to explain that grub needs special steps to work with secure boot enabled. if secure boot is off you can ignore that part.

is secure boot enabled in the firmware? It is possible that you have a signed grub binary installed but the module signing is not yet rolled out. Edit: my mistake: if you are using grub with shim then all the necessary modules need to be baked into the grub binary. maybe grub was not installed correctly?

woah this is awesome!

maglevs need classical wheel systems anyway because there might be a power outage, so simply having wheels that are compatible with the local rail system is a brilliant idea.

add in a tiny propulsion system so they can use the normal tracks at low speed without the help of the maglev tracks and you can sort of blend the two systems together in critical locations like switches and train stations.