Same for me. I have already seen that Java issue elsewhere and it was actually because a wrong binary (wrong processor architecture in that case it was) was installed. Could have been a bad package build or anything, we will not find out.
As the OP said he didn’t update anything this cannot apply here, then again his statement may or may
not be right. But I would have expected a java swap like he did to cure that if that had been the cause.
Yes.
Zram is enabled on fresh installs.
FYI however the more relevant background link is this.