You show /ubuntu folder in efi partition which would not be a locked efi?
Boot-Repair picks up on this issue.
grub-efi fails to install with Input/output error - locked efi
https://bugs.launchpad.net/ubuntu/+s...2/+bug/1090829
https://bugs.launchpad.net/ubuntu/+s...2/+bug/1091477
Boot-Repair is just a script that runs in the Ubuntu live installer or can be a full ISO bootable repair installer. If you have live installer without persistence you will have to download each time you reboot or may have to reinstall every time.
The locked efi, is something in the FAT32 efi partition. Supposedly there is no way to lock that and it is only FAT32, so some bug in FAT32 partition?
A few have been able to run chkdsk from Windows on the efi partition and fixed it.
But most have just had to fully back up the entire efi partition - it is not large. Then totally delete it with gparted in live system, and then recreate it and restore data from backup.
The efi partition is a FAT32 formatted partition with the boot flag (if using gparted). It is only on gpt partitioned drives and you can only have one efi partition per hard drive.
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