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I have and installed on two different partitions on this Macbook, if I update to macOS Catalina is there anything it can do to fuck up the partition? Boot manager issued etc?

@liaizon it only ever happened the other way around for me tbh. is your disk APFS yet? i imagine that conversion might cause troubles

@tom yeah I already did that part. Running Mojave and Ubuntu 19.10

@liaizon then you should be fine i think? still probably a good idea to have backups around tho

@tom no backup :( no external hard drives with space on them. Need to get some new ones...

@liaizon Pretty much every time I update macOS the boot order gets reset. If you boot into a live USB you can use efibootmgr to change the boot order making Ubuntu boot before macOS.

This seems to be a pretty good overview of how to use efibootmgr: linuxbabe.com/command-line/how.

@liaizon (there's a lot more info there, but you should only have to worry about changing the boot order)

@james did it fuck up booting by holding down the option key and selecting partition that way? Cause thats how I am currently switching between installs

@liaizon No, I'm sure that's fine. It's been a while, but I think I just set mine up with grub as the default for convenience.

If I remember right efibootmgr only has macOS selected after an upgrade. So I think you could use it to set macOS as the first option and Ubuntu as the second option and then it _should_ show up when you hold down the option key, but boot into macOS by default.

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