Hi guys/girls, I’m facing the same problem with this thread: Unable to boot - error: symbol `grub_alloc’ not found though mine was triggered by an attempt of mine to unsuccessfully boot from a live USB. The live USB wouldn’t boot so I was trying all the available boot options in UEFI, legacy, UEFI with CSM, UEFI, boot priorities to no avail. After a restart with the previous “working” options set back I was welcomed with the above. I didn’t try the solution proposed there as it was not marked as the one and before trying to attempt numerous things I had in mind I thought it would be way better to ask the profis 
So before trying that with the live USB my UEFI had 2 entries to choose from, Manjaro and UEFI:OS , the system booted with Manjaro , but now it isn’t listed in the UEFI, I assume something of the above somehow deleted it?
Here are some info for you booted from a rescue USB with Manjaro, and from inside chroot -a:
[manjaro boot]# fdisk -l
Disk /dev/sda: 238.47 GiB, 256060514304 bytes, 500118192 sectors
Disk model: TOSHIBA THNSNJ25
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 5AA4BE13-233B-5E47-A92E-D08D0848B3E5
Device Start End Sectors Size Type
/dev/sda1 2048 1050623 1048576 512M EFI System
/dev/sda2 1050624 49285119 48234496 23G Linux filesystem
/dev/sda3 49285120 493826047 444540928 212G Linux filesystem
/dev/sda4 493826048 500118158 6292111 3G Linux swap
[manjaro boot]# lsblk -l
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 238.5G 0 disk
sda1 8:1 0 512M 0 part /boot/efi
sda2 8:2 0 23G 0 part /
sda3 8:3 0 212G 0 part /home
sda4 8:4 0 3G 0 part
[manjaro boot]# cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a device; this may
# be used with UUID= as a more robust way to name devices that works even if
# disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
UUID=967B-DD95 /boot/efi vfat umask=0077 0 2
UUID=0e80bbe4-aed2-4f8d-9585-ff0caae4b265 / ext4 defaults,noatime 0 1
UUID=951024f3-a06a-4604-8b8a-b3532c491e4f /home ext4 defaults,noatime 0 2
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
[manjaro boot]# efibootmgr -v
BootCurrent: 0004
Timeout: 1 seconds
BootOrder: 0003,0004,0005
Boot0003* UEFI OS HD(1,GPT,7b147200-18a6-8f45-98e1-810b0660c330,0x800,0x100000)/File(\EFI\BOOT\BOOTX64.EFI)..BO
Boot0004* UEFI: Memorex Cool Drive B PMAP PciRoot(0x0)/Pci(0x14,0x0)/USB(1,0)/CDROM(1,0x46ef5c,0x8000)..BO
Boot0005 UEFI: Memorex Cool Drive B PMAP, Partition 1 PciRoot(0x0)/Pci(0x14,0x0)/USB(1,0)/HD(1,MBR,0x0,0x46ef5c,0x2000)..BO
The contents of /boot/*:
[manjaro boot]# ls * -R
initramfs-5.10-x86_64-fallback.img initramfs-5.11-x86_64-fallback.img intel-ucode.img linux511-x86_64.kver vmlinuz-5.11-x86_64
initramfs-5.10-x86_64.img initramfs-5.11-x86_64.img linux510-x86_64.kver vmlinuz-5.10-x86_64
efi:
EFI
efi/EFI:
Manjaro boot
efi/EFI/Manjaro:
grubx64.efi
efi/EFI/boot:
bootx64.efi
grub:
fonts grub.cfg grubenv themes x86_64-efi
grub/fonts:
unicode.pf2
grub/themes:
starfield
grub/themes/starfield:
COPYING.CC-BY-SA-3.0 boot_menu_e.png boot_menu_s.png dejavu_10.pf2 dejavu_bold_14.pf2 starfield.png terminal_box_ne.png terminal_box_sw.png
README boot_menu_n.png boot_menu_se.png dejavu_12.pf2 slider_c.png terminal_box_c.png terminal_box_nw.png terminal_box_w.png
blob_w.png boot_menu_ne.png boot_menu_sw.png dejavu_14.pf2 slider_n.png terminal_box_e.png terminal_box_s.png theme.txt
boot_menu_c.png boot_menu_nw.png boot_menu_w.png dejavu_16.pf2 slider_s.png terminal_box_n.png terminal_box_se.png
grub/x86_64-efi:
acpi.mod cmp.mod ext2.mod geli.mod loadenv.mod mpi.mod pbkdf2.mod signature_test.mod usbserial_ftdi.mod
adler32.mod cmp_test.mod extcmd.mod gettext.mod loopback.mod msdospart.mod pbkdf2_test.mod sleep.mod usbserial_pl2303.mod
affs.mod command.lst f2fs.mod gfxmenu.mod ls.mod mul_test.mod pcidump.mod sleep_test.mod usbserial_usbdebug.mod
afs.mod configfile.mod fat.mod gfxterm.mod lsacpi.mod multiboot.mod pgp.mod smbios.mod usbtest.mod
afsplitter.mod core.efi file.mod gfxterm_background.mod lsefi.mod multiboot2.mod play.mod spkmodem.mod verifiers.mod
ahci.mod cpio.mod fixvideo.mod gfxterm_menu.mod lsefimmap.mod nativedisk.mod png.mod squash4.mod video.lst
all_video.mod cpio_be.mod font.mod gptsync.mod lsefisystab.mod net.mod priority_queue.mod strtoull_test.mod video.mod
aout.mod cpuid.mod fs.lst grub.efi lsmmap.mod newc.mod probe.mod syslinuxcfg.mod video_bochs.mod
appleldr.mod crc64.mod fshelp.mod gzio.mod lspci.mod nilfs2.mod procfs.mod tar.mod video_cirrus.mod
archelp.mod crypto.lst functional_test.mod halt.mod lssal.mod normal.mod progress.mod terminal.lst video_colors.mod
at_keyboard.mod crypto.mod gcry_arcfour.mod hashsum.mod luks.mod ntfs.mod raid5rec.mod terminal.mod video_fb.mod
ata.mod cryptodisk.mod gcry_blowfish.mod hdparm.mod luks2.mod ntfscomp.mod raid6rec.mod terminfo.mod videoinfo.mod
backtrace.mod cs5536.mod gcry_camellia.mod hello.mod lvm.mod odc.mod random.mod test.mod videotest.mod
bfs.mod ctz_test.mod gcry_cast5.mod help.mod lzopio.mod offsetio.mod rdmsr.mod test_blockarg.mod videotest_checksum.mod
bitmap.mod date.mod gcry_crc.mod hexdump.mod macbless.mod ohci.mod read.mod testload.mod wrmsr.mod
bitmap_scale.mod datehook.mod gcry_des.mod hfs.mod macho.mod part_acorn.mod reboot.mod testspeed.mod xfs.mod
blocklist.mod datetime.mod gcry_dsa.mod hfsplus.mod mdraid09.mod part_amiga.mod regexp.mod tftp.mod xnu.mod
boot.mod disk.mod gcry_idea.mod hfspluscomp.mod mdraid09_be.mod part_apple.mod reiserfs.mod tga.mod xnu_uuid.mod
boottime.mod diskfilter.mod gcry_md4.mod http.mod mdraid1x.mod part_bsd.mod relocator.mod time.mod xnu_uuid_test.mod
bsd.mod div.mod gcry_md5.mod iorw.mod memdisk.mod part_dfly.mod romfs.mod tpm.mod xzio.mod
bswap_test.mod div_test.mod gcry_rfc2268.mod iso9660.mod memrw.mod part_dvh.mod scsi.mod tr.mod zfs.mod
btrfs.mod dm_nv.mod gcry_rijndael.mod jfs.mod minicmd.mod part_gpt.mod search.mod trig.mod zfscrypt.mod
bufio.mod echo.mod gcry_rmd160.mod jpeg.mod minix.mod part_msdos.mod search_fs_file.mod true.mod zfsinfo.mod
cacheinfo.mod efi_gop.mod gcry_rsa.mod json.mod minix2.mod part_plan.mod search_fs_uuid.mod udf.mod zstd.mod
cat.mod efi_uga.mod gcry_seed.mod keylayouts.mod minix2_be.mod part_sun.mod search_label.mod ufs1.mod
cbfs.mod efifwsetup.mod gcry_serpent.mod keystatus.mod minix3.mod part_sunpc.mod serial.mod ufs1_be.mod
cbls.mod efinet.mod gcry_sha1.mod ldm.mod minix3_be.mod partmap.lst setjmp.mod ufs2.mod
cbmemc.mod ehci.mod gcry_sha256.mod legacy_password_test.mod minix_be.mod parttool.lst setjmp_test.mod uhci.mod
cbtable.mod elf.mod gcry_sha512.mod legacycfg.mod mmap.mod parttool.mod setpci.mod usb.mod
cbtime.mod eval.mod gcry_tiger.mod linux.mod moddep.lst password.mod sfs.mod usb_keyboard.mod
chain.mod exfat.mod gcry_twofish.mod linux16.mod modinfo.sh password_pbkdf2.mod shift_test.mod usbms.mod
cmdline_cat_test.mod exfctest.mod gcry_whirlpool.mod loadbios.mod morse.mod pata.mod shim_lock.mod usbserial_common.mod
memtest86+:
memtest.bin
syslinux:
syslinux.cfg
How should I proceed? Thanks in advance.
