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Never trusted this setup to begin with because I didn't trust Microsoft and I'm not all that capable or want to take time to sort this stuff out on a regular basis.
So I just setup my ThinkPad laptop with two removable SSDs and I just swap one or the other whenever I need. The drive is easily switched, from power down, remove drive, insert other drive and restart only takes about two minutes.
I'm not going to risk messing up my setup because two operating systems can't work with one another.
Besides I seldom switch, I use Windows if I really have to about three or four times a year.
Wine won’t work?
I really wish Excel would work on wine. It's the only reason I do occasionally fire up windows on my duel boot. (And no the open source / browser based spreadsheet options don't always suffice, brilliant as they are).
I recently had this issue needing to run Excel macros. I ended up using Oracle Virtualbox to run Windows from inside linux. Even more linuxey is using Proxmox to run your Windows VMs but that's a bit more of a faff.
Don't use virtualbox, instead use virt-manager (KVM). KVM is faster and doesn't do awful stuff to their users.
Oh shit, that's awesome, thanks for the heads up!