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Yeah, I think you're only suppossed to have one bootloader. Just multiple entries in the EFI.
Can't create more than 4 primary partitions.
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dbarron So the question remains-what do I do xD
Simply deleting W10 bootloader will result in unabillity of booting in in my opinion. Because I can't display both OS with 2 bootloaders, I probably would't with just one 
Or I should delete it and then run the sudo commands, but what if it fails?!
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What you needed to do was install the bootloader from solus on the same disk and partition as the Windows one was using, so they live together. Otherwise (as you stand now), you have to choose the proper disks as boot device every time you want to change which boots.
I can't really tell you how to do this, because I never really retain these things. I just do them (and I'm visually oriented..I have to do/see it).
dbarron Well from what I understand I can do that-I need GRUB:
https://superuser.com/questions/202057/how-to-list-hard-disks-to-choose-one-to-boot-from-at-the-startup
But don't know what is this and how to do it...meanwile I will search if there is GRUB in the software center.
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dbarron The case is Emperor has W10 installed in MBR. Solus is installed in EFI.
Emperor It's normal that it doesn't display the password (not even asterisks) for security reasons. No output means usually that the command is successful.
Emperor Solus uses GRUB only in MBR mode. So either you have to boot into Windows via your motherboard's boot menu (which works as intended) or reformat your Solus HDD and reinstall in MBR mode.
In my honest opinion the best option would be to reinstall W10 in EFI, and select the OS via motherboard's boot menu, as that's the intended way.
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[deleted] Reinstalling W10 would mean that I will lose all programs-this is just too much work-I prefer to boot from W10 for my father and when I need to use my PC I will boot via F12...
Although are you sure both of them must be only MBR or GPT?
On multiple places there is that list of commands that you mount different bootloaders, then do some commands, from which the final one is update-grub(your favorite xD).
I may be completely wrong, but it sounds logical to me to show the locations of different bootloaders to GRUB manually and tell it to give you choice when you boot(like Solus-dev/sda....; W10-dev/sdb...; if choose bootloader 1-start Solus, if choose bootloader 2-start W10).
https://askubuntu.com/questions/681422/grub-menu-not-showing-with-dual-boot-uefi-mode-installation
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Emperor Well, then you can just change your motherboard to boot from P1 by default, so it would boot W10 in case you don't press F12.
Wow what a brutal journey and much learned. This is how it works for many sometimes including me. You made it to the other side. Great people helping here, too.
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I just downloaded waterfox, but I have to remember where I put it and I can run it by opening folders and clicking on the icon-is there a way to put waterfox where other apps are and create shortcut-an icon to open it just like regular apps.
P.S. I used the script provided in Joplin website and it's working just fine It automatically installed the app and it's looking just like the others. That's what I want to do with Waterfox-I need separate browsers-one for accounts and the other for browsing.
Waterfox was downloaded in temporary files, which I think would be deleted so I moved it into downloaded.
I am confused by the file manager for the root and home partition-is there a folder just like in W10 like program files-and that is where the apps are stored with their settings, libraries and so on?
Don't know how Joplin and waterfox will update though. Waterfox has an icon for updating, but I suppose it will run it automatically by itself.
Applications in /usr/bin/ and libraries in /usr/lib64. Settings globally are stored in /usr/share/APPNAME/defaults or /etc, user settings in ~/.config. This where most applications store things. Some are a bit partiuclar.
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Well guys we've got to your favorite part-drivers 
The problem is in my speakers-there seems to be plugged a device and all the volume settings are at 100% but there is no sound. That being said this speakers were problematic even in W10-I install their drivers and after that I had to go into some settings to specify something about that they are connected to the front ports of the PC...although that seems common for Windows.
I opened the drivers program in Solus and it said nothing is found-so the problem won't be resolved so easily.
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algent Given the complexity(different HDDs,different formats of HDDs,different formats of bootloaders) I won't be able to do it myself-for now I use F12, but it's buggy and sometimes I got to choose between something like solus 4.xxx.xxxxxxx and solus 5.xxx.xx -I go with the 5-it's the default where the PC boots automatically after 3 seconds.
There are 3 additional problems-speakers won't work and I can't find the directory of Thunderbird's calendars nor can I import them...I haven't found another locally stored good calendar except Thunderbird.
And the last one is that I downloaded and unzipped waterfox, but I store it in downloaded and I have perform like 20 clicks before open it-I can't put it where other programs are(I don't have permission-no option even for typing password)-well I don't know what I am doing so perhaps I wouldn't be OK even after I move waterfox xD When it's opened I don't have an option to make it favorite.
