That is most likey a Linux problem in general. Linux is known to have worse energy management. TFA explains the owner had to enable deep sleep and hibernation:

That is most likey a Linux problem in general. Linux is known to have worse energy management. TFA explains the owner had to enable deep sleep and hibernation: > One of the initial caveats with installing Ubuntu is that deep sleep and hibernate are not enabled by default. Deep sleep is easy to enable. Hibernate takes a bit more effort, but it’s straightforward. Once configured it works like a charm. I noticed about a 2% drain in 3 days of hibernation. If this power loss is linear, it can go for weeks in hibernation.