Here is the article I was thinking of. I don’t believe this has to do with your system unless it’s very new one. But just in case: https://support.apple.com/en-us/HT208330
, Secure Boot offers three settings to make sure that your Mac always starts up from a legitimate, trusted Mac operating system or Microsoft Windows operating system: Full Security, Medium Security, and No Security. Secure Boot settings are available in Startup Security Utility: Turn on your Mac, then press and hold Command (⌘)-R immediately after you see the Apple logo to start up from macOS Recovery. When you see the macOS Utilities window, choose Utilities > Startup Security Utility from the menu bar. When you're asked to authenticate, click Enter macOS Password, then choose an administrator account and enter its password. Full Security Full Security is the default Secure Boot setting, offering the highest level of security. This is a level of security previously available only on iOS devices. During startup, your Mac verifies the integrity of the operating system (OS) on your startup disk to make sure that it's legitimate. If the OS is unknown or can't be verified as legitimate, your Mac connects to Apple to download the updated integrity information it needs to verify the OS. This information is unique to your Mac, and it ensures that your Mac starts up from an OS that is trusted by Apple. If FileVault is enabled while your Mac is attempting to download updated integrity information, you're asked to enter a password to unlock the disk. Enter your administrator password, then click Unlock to complete the download. If the OS doesn't pass verification: macOS: An alert informs you that a software update is required to use this startup disk. Click Update to open the macOS installer, which you can use to reinstall macOS on the startup disk. Or click Startup Disk and choose a different startup disk, which your Mac will also attempt to verify. Windows: An alert informs you that you need to install windows with Boot Camp Assistant. If your Mac can't connect to the Internet, it displays an alert that an Internet connection is required. Check your Internet connection, such as by choosing an an active network from Wi-Fi status menu in the menu bar. Then click Try Again. Or click Startup Disk and choose a different startup disk. Or use Startup Security Utility to lower the security level to Medium Security. Medium Security During startup when Medium Security is turned on, your Mac verifies the OS on your startup disk only by making sure that it has been properly signed by Apple (macOS) or Microsoft (Windows). This doesn't require an Internet connection or updated integrity information from Apple, so it doesn't prevent your Mac from using an OS that is no longer trusted by Apple. If the OS doesn't pass verification: macOS: An alert informs you that a software update is required to use this startup disk. Click Update to open the macOS installer, which you can use to reinstall macOS on the startup disk. This requires an Internet connection. Or click Startup Disk and choose a different startup disk, which your Mac will also attempt to verify. Windows: An alert informs you that you need to install windows with Boot Camp Assistant. No Security The No Security setting doesn't enforce any of the above security requirements for your startup disk. Best wishes, Jonathan Cohn > On Oct 10, 2018, at 4:58 PM, 'Tim Kilburn' via MacVisionaries > <[email protected]> wrote: > > Hi, > > This is a slightly different area than I usually dive into, so, I'm not > confident in all aspects of these commands. With that in mind, I believe > that you are correct in that you'll need to edit the boot.efi file in the > given path to allow the use of System Prefs to properly bless thee EFI > partition. Blessing the partition should subsequently allow booting to your > Linex OS. Now, I always add to my help that "should" is my favourite word. > Therefore, if it doesn't work, I've got an out. Beyond this basic > understanding, I'd need to actually see what the boot.efi file has for > defaults to know if there's anything that can safely be edited. > > Sorry, I'm not much help with this one. > > Later... > > Tim Kilburn > Apple Teacher > (with Swift Playgrounds Recognition) > Fort McMurray, AB Canada > > On Oct 10, 2018, at 13:43, 'Janina Sajka' via MacVisionaries > <[email protected]> wrote: > > Thanks, Tim. I saw this post earlier today on a Google search. Here's > the statement that confused me: > > > UPDATE: probably a bug, placing efi shell to > /usr/standalone/i386/boot.efi location and using system prefs to > reboot into target volume (which will rebless the > partition) helped to get efi shell booted. no sig check obviously. > > > I understand this to be saying that I should copy something different > into the location /usr/standalone/i386/boot.efi. Is that correct. > > I'm also enough of a Mac novice that I don't understand the reference to > "using System Prefs." > > However, if I do understand the import of the above, taking these two > steps correctly might resolve my issue? Am I reading that correctly so > far? > > Janina > > > 'Tim Kilburn' via MacVisionaries writes: >> Hi, >> >> The only thing I've found to help is here: >> >> http://netkas.org/?p=1472 >> >> There's chatter about this in the Apple Developer forums, but no real >> solution that I found, just a reference to the link above. >> >> Later... >> >> Tim Kilburn >> Apple Teacher >> (with Swift Playgrounds Recognition) >> Fort McMurray, AB Canada >> >> On Oct 10, 2018, at 12:12, 'Janina Sajka' via MacVisionaries >> <[email protected]> wrote: >> >> Hi, Maurice: >> >> Yes, I do indeed remember. Bill is still very much missed. >> >> My current problem appears to be the result of upgrading osx from High >> Sierra to Mojave. I'm able to execute an EFI launch, but OSX 10.14 seems >> unable to follow through. The USB 3.1 stick containing the Linux >> installation has not changed. Exactly what used to work under High >> Sierra is what no longer works under Mojave, though it's clear Mojave is >> correctly reading the configuration data because it's error messages >> correctly identify the root Linux partition by UUID. >> >> And, addressing your point, I have thought of mounting via virtual >> machine. Once upon a time I had VMware working, but I got tired of the >> regular upgrades to VMware which seemed never to improve the >> accessibility of the product. I had it working, but it wasn't a >> compelling environment for me, and I had a good deal of trouble between >> the guest OS and the vm chrome. >> >> >> I have not had the time to learn how to create a Virtual Box environment >> to do the same thing. It's what I would try next. I'm quite finished >> with VMware. >> >> Best, >> >> Janina >> >> Maurice Mines writes: >>> Hello, I don’t know if you remember me from the Lenox days, and our late >>> neutral friend Bill. I am wondering if I am reading this correctly you’re >>> saying that not only is the Efi partition broken, but you’re also having >>> flash drive issues with boot camp? Have you ever thought about possibly >>> virtualizing your windows? I’m just thinking that might be something >>> helpful? >>> >>> I’m hoping the suggestion might be helpful. >>> >>> Sincerely Maurice Mines. >>> >>>> On 10 Oct 2018, at 5:53, 'Janina Sajka' via MacVisionaries wrote: >>>> >>>> Hi, All: >>>> >>>> The other day I upgraded my Airbook from High Sierra to Mojave. The >>>> upgrade concluded without issues, and almost everything seems to be >>>> working. >>>> >>>> * Everything on the Mac side seems OK >>>> * My Windows 10 (upgraded to 1803) seems OK via Bootcamp >>>> * My USB booting over EFI is now broken. >>>> >>>> The same USB stick that worked perfectly well under High Sierra no >>>> longer works. >>>> >>>> The error message on screen complains of an inability to find the UUID >>>> which identifies the Linux root partition. I have confirmed that UUID >>>> has not changed. >>>> >>>> If anyone has suggestions, I would be most appreciative. Thanks in >>>> advance. >>>> >>>> Janina >>>> >>>> >>>> -- >>>> >>>> Janina Sajka >>>> >>>> Linux Foundation Fellow >>>> Executive Chair, Accessibility Workgroup: http://a11y.org >>>> >>>> The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI) >>>> Chair, Accessible Platform Architectures http://www.w3.org/wai/apa >>>> >>>> -- >>>> The following information is important for all members of the Mac >>>> Visionaries list. >>>> >>>> If you have any questions or concerns about the running of this list, or >>>> if you feel that a member's post is inappropriate, please contact the >>>> owners or moderators directly rather than posting on the list itself. >>>> >>>> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark >>>> at: [email protected] and your owner is Cara Quinn - you can reach Cara at >>>> [email protected] >>>> >>>> The archives for this list can be searched at: >>>> http://www.mail-archive.com/[email protected]/ >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "MacVisionaries" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To post to this group, send email to [email protected]. >>>> Visit this group at https://groups.google.com/group/macvisionaries. >>>> For more options, visit https://groups.google.com/d/optout. >>> >>> -- >>> The following information is important for all members of the Mac >>> Visionaries list. >>> >>> If you have any questions or concerns about the running of this list, or if >>> you feel that a member's post is inappropriate, please contact the owners >>> or moderators directly rather than posting on the list itself. >>> >>> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: >>> [email protected] and your owner is Cara Quinn - you can reach Cara at >>> [email protected] >>> >>> The archives for this list can be searched at: >>> http://www.mail-archive.com/[email protected]/ >>> --- You received this message because you are subscribed to the Google >>> Groups "MacVisionaries" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at https://groups.google.com/group/macvisionaries. >>> For more options, visit https://groups.google.com/d/optout. >> >> -- >> >> Janina Sajka >> >> Linux Foundation Fellow >> Executive Chair, Accessibility Workgroup: http://a11y.org >> >> The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI) >> Chair, Accessible Platform Architectures http://www.w3.org/wai/apa >> >> -- >> The following information is important for all members of the Mac >> Visionaries list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: >> [email protected] and your owner is Cara Quinn - you can reach Cara at >> [email protected] >> >> The archives for this list can be searched at: >> http://www.mail-archive.com/[email protected]/ >> --- >> You received this message because you are subscribed to the Google Groups >> "MacVisionaries" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at https://groups.google.com/group/macvisionaries. >> For more options, visit https://groups.google.com/d/optout. >> >> -- >> The following information is important for all members of the Mac >> Visionaries list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: >> [email protected] and your owner is Cara Quinn - you can reach Cara at >> [email protected] >> >> The archives for this list can be searched at: >> http://www.mail-archive.com/[email protected]/ >> --- >> You received this message because you are subscribed to the Google Groups >> "MacVisionaries" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at https://groups.google.com/group/macvisionaries. >> For more options, visit https://groups.google.com/d/optout. > > -- > > Janina Sajka > > Linux Foundation Fellow > Executive Chair, Accessibility Workgroup: http://a11y.org > > The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI) > Chair, Accessible Platform Architectures http://www.w3.org/wai/apa > > -- > The following information is important for all members of the Mac Visionaries > list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: > [email protected] and your owner is Cara Quinn - you can reach Cara at > [email protected] > > The archives for this list can be searched at: > http://www.mail-archive.com/[email protected]/ > --- > You received this message because you are subscribed to the Google Groups > "MacVisionaries" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/macvisionaries. > For more options, visit https://groups.google.com/d/optout. > > -- > The following information is important for all members of the Mac Visionaries > list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: > [email protected] and your owner is Cara Quinn - you can reach Cara at > [email protected] > > The archives for this list can be searched at: > http://www.mail-archive.com/[email protected]/ > --- > You received this message because you are subscribed to the Google Groups > "MacVisionaries" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/macvisionaries. > For more options, visit https://groups.google.com/d/optout. -- The following information is important for all members of the Mac Visionaries list. If you have any questions or concerns about the running of this list, or if you feel that a member's post is inappropriate, please contact the owners or moderators directly rather than posting on the list itself. Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: [email protected] and your owner is Cara Quinn - you can reach Cara at [email protected] The archives for this list can be searched at: http://www.mail-archive.com/[email protected]/ --- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/macvisionaries. For more options, visit https://groups.google.com/d/optout.
