I believe one *has* to turn off Secure Boot when booting from any sort of removable media. I also believe one Linux has been instally onto the local hard drive, it should be possible to turn Secure Boot back on -- I believe you need to be sure the installer does what is needful with the UFI boot setup (I believe the installer does this or asks about this).
At Mon, 5 Oct 2026 09:22:42 -0500 nwe <[email protected]> wrote: > > On 10/4/26 4:06 PM, MartinGary Padgett wrote: > > > (Not yet ready to learn 13 'Trixie'.) > I don't know that there would be anything 'new' for a user to learn > here. Is there noticeable difference to the interface? > > Then I opened the desktop, put the disk in the desktop optical drive, > > and restartedÃÂ it. All that happened: the BIOS appeared. That is all. > > > > I still have an older optical disk for Debian 12 dated 2015-06-19. > > > This one did not open the BIOS; instead right after the desktop opened > > a full blue screen appeared with the word ERROR at the top. The next > > line said 'Verification failed: (Ox1A) Security Violation. Then on > > hitting the OK in the middleÃÂ of the screen the BIOS returned. > > Do you have secure boot feature switched off in the bios? In the past > I've had linux fail to boot, showing some kind of security errors if > secure boot was switched on. > > As far as I know, secure boot prevents your pc from booting any os > unless it is enrolled in the secure boot. I think Debian supports secure > boot, but I never bother with it, instead I switch it off in the bios. > > > > Attachment saved: > /usr/tmp/1791213287/Email/13/Attachments/OpenPGP_signature.asc > (application/pgp-signature) > -- Robert Heller -- Cell: 413-658-7953 GV: 978-633-5364 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services [email protected] -- Webhosting Services
