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why secure boot is now failing?

cn flag

i had secure boot enabled on my dell 9320 with factory windows. after booting it from a flashdrive, i've installed ubuntu, where i opted to install proprietary drivers and with this i had to enroll mok (using the same password as provided at the instalation wizard).

after a while, i tried to recover windows from dell's recovery tool, and it failed. with this, i formated my laptop with my flashdrive to have a working ubuntu again, but this time the flashdrive failed on secure boot, so i had to deactivate it. after that, i could install ubuntu.

how can i recover the state where external flashdrives can boot my machine with secure boot on?

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