Peter-Buyze BTW, I have not tried the Bios/Uefi+key mash because I am not sure how to do that, and in any case it sounds like a workaround, not a solution.
To access the Boot Menu during startup, you boot the computer while continually pressing a specific key, pressing the key about once per second. The key you press depends on your computer manufacturer and/or motherboard.
A list of common keys, sorted by manufacturer and motherboard, can be found at the University of Wisconsin's DoItHelpDesk's "Booting to the Boot Menu and BIOS" article. My computers are all Dell, so F2 brings up BIOS/UEFI settings and F12 brings up the Boot Menu.
As I see things, this is not a workaround. I dual boot, but I use dual-drive, dual-boot set up in a way that the two drives do not see each other at all during the boot process. I use the startup Boot Menu to select the operating system I am going to boot and BIOS/UEFI settings to determine boot priority. On my dual-boot Solus/Windows computer, I boot into Solus 80-90% of the time, so Linux Boot Manager (Solus) is primary and Windows Boot Manager secondary. That way, the computer automatically boots into Solus unless I intervene.
I adopted this method after years of trouble with Windows/Solus/Grub booting, and I have never had a problem setting up different OS's on different drives and keeping the boot loaders and boot partitions completely separate from one another. This method will not work as easily, of course, if you are trying to set up several OS's on a single drive, although I understand that is is possible to set up separate boot partitions, one for each OS, and have a workable system that can boot from the Boot Menu. I've not personally tried that, though.
The problem with Grub is that, like the Windows Boot Manager, it wants to take over the boot process entirely, and I always ended up, sooner or later, with a mess. That's why I prefer to avoid using Grub to control the boot process, and boot from the startup Boot Menu.
Peter-Buyze My questions:
how can I make Solus show up in the Grub?
I've read a lot of conflicting advice about whether this is possible, and if so, how to do it. A number of the "solutions" require Solus to be booted from Legacy (BIOS/Grub) rather than UEFI/EFI, and that is not something I am willing to do. I hope that someone will come along who can give you solid, accurate advice.
