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Top one has to be my favorite. I've gotten it once. I did manage to get it to boot and fixed it but at the time I was just like: "oh....well shit"
do you remember what causes it? and what was the fix?
When a (typical) Linux system boots up, it first goes through an "early boot" environment that just has some basic drivers and things. The entire purpose of this environment is to find where your actual root file system is (which could theoretically be on something quite complicated, like RAID or a network file system), mount that, and then transition to the "real" system.
That error appears when something goes wrong with mounting the real file system.
I had this happen to me recently too, with an EndeavourOS live USB. In my case, it turned out to be due to a faulty flash, reflashing with Rufus fixed it.