root@laptop:/sys/firmware/efi/efivars# strace -ff efibootmgr -b 0000 -B execve("/bin/efibootmgr", ["efibootmgr", "-b", "0000", "-B"], 0x7fff3ef3c210 /* 25 vars */) = 0 brk(NULL) = 0x55e921747000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=99288, ...}) = 0 mmap(NULL, 99288, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f1d82acc000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libefivar.so.1", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0203\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=138312, ...}) = 0 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1d82aca000 mmap(NULL, 141136, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f1d82aa7000 mmap(0x7f1d82aaa000, 69632, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f1d82aaa000 mmap(0x7f1d82abb000, 16384, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0x7f1d82abb000 mmap(0x7f1d82abf000, 45056, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7f1d82abf000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libefiboot.so.1", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P$\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=55216, ...}) = 0 mmap(NULL, 57376, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f1d82a98000 mmap(0x7f1d82a9a000, 32768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f1d82a9a000 mmap(0x7f1d82aa2000, 12288, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa000) = 0x7f1d82aa2000 mmap(0x7f1d82aa5000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xc000) = 0x7f1d82aa5000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260A\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1996592, ...}) = 0 mmap(NULL, 2004992, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f1d828ae000 mprotect(0x7f1d828d0000, 1826816, PROT_NONE) = 0 mmap(0x7f1d828d0000, 1511424, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x22000) = 0x7f1d828d0000 mmap(0x7f1d82a41000, 311296, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x193000) = 0x7f1d82a41000 mmap(0x7f1d82a8e000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1df000) = 0x7f1d82a8e000 mmap(0x7f1d82a94000, 14336, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1d82a94000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\21\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=18656, ...}) = 0 mmap(NULL, 20752, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f1d828a8000 mmap(0x7f1d828a9000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7f1d828a9000 mmap(0x7f1d828ab000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f1d828ab000 mmap(0x7f1d828ac000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f1d828ac000 close(3) = 0 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1d828a6000 arch_prctl(ARCH_SET_FS, 0x7f1d828a6b80) = 0 mprotect(0x7f1d82a8e000, 16384, PROT_READ) = 0 mprotect(0x7f1d828ac000, 4096, PROT_READ) = 0 mprotect(0x7f1d82abf000, 4096, PROT_READ) = 0 mprotect(0x7f1d82aa5000, 4096, PROT_READ) = 0 mprotect(0x55e920d53000, 4096, PROT_READ) = 0 mprotect(0x7f1d82b0e000, 4096, PROT_READ) = 0 munmap(0x7f1d82acc000, 99288) = 0 access("/sys/firmware/efi/efivars/", F_OK) = 0 statfs("/sys/firmware/efi/efivars/", {f_type=EFIVARFS_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={val=[0, 0]}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0 brk(NULL) = 0x55e921747000 brk(0x55e921768000) = 0x55e921768000 openat(AT_FDCWD, "/sys/firmware/efi/efivars/", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 fcntl(3, F_GETFD) = 0x1 (flags FD_CLOEXEC) fcntl(3, F_SETFD, FD_CLOEXEC) = 0 getdents64(3, /* 50 entries */, 32768) = 3560 getdents64(3, /* 0 entries */, 32768) = 0 close(3) = 0 openat(AT_FDCWD, "/sys/firmware/efi/efivars/Boot0000-8be4df61-93ca-11d2-aa0d-00e098032b8c", O_RDONLY) = 3 read(3, "\7\0\0\0", 4) = 4 read(3, "\1\0\0\0b\0u\0b\0u\0n\0t\0u\0\0\0\4\1*\0\1\0\0\0\0\10\0\0"..., 4096) = 118 read(3, "", 3978) = 0 close(3) = 0 openat(AT_FDCWD, "/sys/firmware/efi/efivars/Boot0003-8be4df61-93ca-11d2-aa0d-00e098032b8c", O_RDONLY) = 3 read(3, "\7\0\0\0", 4) = 4 read(3, "\1\0\0\0\206\0U\0E\0F\0I\0:\0 \0V\0e\0r\0b\0a\0t\0i\0"..., 4096) = 204 read(3, "", 3892) = 0 close(3) = 0 openat(AT_FDCWD, "/sys/firmware/efi/efivars/Boot0000-8be4df61-93ca-11d2-aa0d-00e098032b8c", O_RDONLY) = 3 ioctl(3, FS_IOC_GETFLAGS, 0x7ffc2c864654) = 0 close(3) = 0 unlink("/sys/firmware/efi/efivars/Boot0000-8be4df61-93ca-11d2-aa0d-00e098032b8c") = -1 EINVAL (Invalid argument) write(2, "Could not delete variable", 25Could not delete variable) = 25 write(2, ": Invalid argument\n", 19: Invalid argument ) = 19 exit_group(15) = ? +++ exited with 15 +++ root@laptop:/sys/firmware/efi/efivars# ll total 0 drwxr-xr-x 2 root root 0 Apr 17 00:44 ./ drwxr-xr-x 5 root root 0 Apr 19 14:59 ../ -rw-r--r-- 1 root root 5 Apr 17 00:44 AssetTag-01368881-c4ad-4b1d-b631-d57a8ec8db6b -rw-r--r-- 1 root root 122 Apr 17 00:44 Boot0000-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 208 Apr 17 00:44 Boot0003-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 6 Apr 17 00:44 BootCurrent-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 98 Apr 17 00:44 BootFFFB-5990c250-676b-4ff7-8a0d-529319d0b254 -rw-r--r-- 1 root root 98 Apr 17 00:44 BootFFFC-5990c250-676b-4ff7-8a0d-529319d0b254 -rw-r--r-- 1 root root 98 Apr 17 00:44 BootFFFD-5990c250-676b-4ff7-8a0d-529319d0b254 -rw-r--r-- 1 root root 98 Apr 17 00:44 BootFFFE-5990c250-676b-4ff7-8a0d-529319d0b254 -rw-r--r-- 1 root root 5 Apr 17 00:44 BootList-65cbd9d9-ab77-4a61-b288-2763405d588a -rw-r--r-- 1 root root 8 Apr 17 00:44 BootOptionSupport-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 6 Apr 17 00:44 BootOrder-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 28 Apr 17 00:44 CapsuleLongModeBuffer-711c703f-c285-4b10-a3b0-36ecbd3c8be2 -rw-r--r-- 1 root root 34 Apr 17 00:44 ChildHandleDpVar0-01368881-c4ad-4b1d-b631-d57a8ec8db6b -rw-r--r-- 1 root root 38 Apr 17 00:44 ConIn-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 38 Apr 17 00:44 ConInDev-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 34 Apr 17 00:44 ConOut-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 34 Apr 17 00:44 ConOutDev-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 3147 Apr 17 00:44 db-d719b2cb-3d3a-4596-a3bc-dad00e67656f -rw-r--r-- 1 root root 5447 Apr 17 00:44 dbx-d719b2cb-3d3a-4596-a3bc-dad00e67656f -rw-r--r-- 1 root root 8 Apr 17 00:44 DefaultBootOrder-45cf35f6-0d6e-4d04-856a-0370a5b16f53 -rw-r--r-- 1 root root 16 Apr 17 00:44 DellMonotonicCounter-01368881-c4ad-4b1d-b631-d57a8ec8db6b -rw-r--r-- 1 root root 8 Apr 17 00:44 EnterPopupFlag-14a9ec85-46d6-4149-a575-81466c02339f -rw-r--r-- 1 root root 34 Apr 17 00:44 ErrOut-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 34 Apr 17 00:44 ErrOutDev-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 12 Apr 17 00:44 GNVS_PTR-0a602c5b-05a0-40c4-9181-edcd891d0003 -rw-r--r-- 1 root root 53 Apr 17 00:44 GsetLegacyIplDefaultValue-3a21751e-bd32-4825-8754-82a47f01b09b -rw-r--r-- 1 root root 53 Apr 17 00:44 GsetUefiIplDefaultValue-7f3301c7-2405-4765-aa2e-d9ed28aea950 -rw-r--r-- 1 root root 1564 Apr 17 00:44 KEK-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 5 Apr 17 00:44 MemoryOverwriteRequestControl-e20939be-32d4-41be-a150-897f85d49829 -rw-r--r-- 1 root root 8 Apr 17 00:44 MonotonicCounter-01368881-c4ad-4b1d-b631-d57a8ec8db6b -rw-r--r-- 1 root root 12 Apr 17 00:44 OsIndications-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 12 Apr 17 00:44 OsIndicationsSupported-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 5 Apr 17 00:44 OsType-a66919d2-6c45-403e-b00a-9bce58e97315 -rw-r--r-- 1 root root 540 Apr 17 00:44 PBRDevicePath-a9b5f8d2-cb6d-42c2-bc01-b5ffaae4335e -rw-r--r-- 1 root root 7 Apr 17 00:44 PcieSataModVar-5e9a565f-cdc0-413b-ad13-1fe8713ffdcd -rw-r--r-- 1 root root 1399 Apr 17 00:44 PK-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 10 Apr 17 00:44 PlatformLang-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 10 Apr 17 00:44 PlatformLangCodes-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 12 Apr 17 00:44 S3SS-4bafc2b4-02dc-4104-b236-d6f1b98d9e84 -rw-r--r-- 1 root root 5 Apr 17 00:44 SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 5 Apr 17 00:44 ServiceTag-01368881-c4ad-4b1d-b631-d57a8ec8db6b -rw-r--r-- 1 root root 5 Apr 17 00:44 SetupMode-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 132 Apr 17 00:44 SignatureSupport-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 12 Apr 17 00:44 SMBIOS_ENTRY_ADDR-0a602c5b-05a0-40c4-9181-edcd891d0036 -rw-r--r-- 1 root root 6 Apr 17 00:44 Timeout-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 16 Apr 17 00:44 TrEEPhysicalPresence-f24643c2-c622-494e-8a0d-4632579c2d5b -rw-r--r-- 1 root root 36 Apr 17 00:44 UserBootOrder-8be4df61-93ca-11d2-aa0d-00e098032b8c -rw-r--r-- 1 root root 12 Apr 17 00:44 UserBootOrderCount-8be4df61-93ca-11d2-aa0d-00e098032b8c