RESURRECT POP-OS UEFI

RESURRECT POP-OS UEFI

# Goal, be able to boot to PopOS again

# PROBLEM: This system (ROG GS733QSA) is nuts. 
  It only boots into PopOS-21.10. Also, the UEFI entries were just reset apparently because it booted to Windows.
  This caused:
  - PopOs UEFI entries to disappear
  - Bios sound-on-boot to come back (even though it was deactivated).
# NOTES: 
  The sound has to be deactivated in BIOS via a user app (Windows Crate, or asus-linux apps).
  This is because this Bios has been stripped of virtually all user switches (e.g. for virtualization, GPU control, etc).
  It has almost nothing but features related to managing the boot menu.

#
# PREVENTION
#
Assuming that fast-startup in Windows 10 is related to the cause, here's some info on that and removing it.
https://www.howtogeek.com/243901/the-pros-and-cons-of-windows-10s-fast-startup-mode/


#
# SOLUTION - HOW TO RESTORE THE SYSTEM
#

# https://support.system76.com/articles/bootloader/
# System is: SYSTEMD (not grub), UEFI (not legacy Bios), unencrypted hard-drive

# After install, I use gparted to label partitions and file-systems
lsblk -o +FSTYPE,LABEL,PARTLABEL
NAME          MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT                               FSTYPE  LABEL                     PARTLABEL
sda             8:0    1  29.9G  0 disk                                           iso9660 Pop_OS 21.10 amd64 Nvidia 
├─sda1          8:1    1   2.9G  0 part  /media/pwyoung/Pop_OS 21.10 amd64 Nvidia iso9660 Pop_OS 21.10 amd64 Nvidia 
├─sda2          8:2    1     4M  0 part                                           vfat                              
└─sda3          8:3    1    27G  0 part  /media/pwyoung/writable                  ext4    writable                  
nvme0n1       259:0    0 953.9G  0 disk                                                                             
├─nvme0n1p1   259:2    0   100M  0 part                                           vfat    WIN_EFI                   EFI System Partition
├─nvme0n1p2   259:3    0    16M  0 part                                                                             win_reserved
├─nvme0n1p3   259:4    0 660.3G  0 part                                           ntfs    win_c                     win_c
└─nvme0n1p4   259:5    0 293.5G  0 part  /win_data                                ntfs    win_data                  Basic data partition
nvme1n1       259:1    0 953.9G  0 disk                                                                             
├─nvme1n1p1   259:6    0     2G  0 part  /boot/efi                                vfat    POPOS_EFI                 POPOS_EFI
├─nvme1n1p2   259:7    0     8G  0 part                                           swap    popos_swap                
│ └─cryptswap 253:0    0     8G  0 crypt [SWAP]                                   swap    cryptswap                 
├─nvme1n1p3   259:8    0 244.1G  0 part  /                                        ext4                              popos_root
├─nvme1n1p4   259:9    0 244.1G  0 part  /home                                    ext4                              popos_home
└─nvme1n1p5   259:10   0 455.6G  0 part  /run/timeshift/backup                    ext4    pop_timeshift             pop_timeshift

# STEPS
# Make sure the partitions are correct
sudo mount /dev/nvme1n1p3 /mnt # ROOT Partition
sudo mount /dev/nvme1n1p1 /mnt/boot/efi
# System is: SYSTEMD (not grub), UEFI (not legacy Bios), unencrypted hard-drive
for i in dev dev/pts proc sys run; do sudo mount -B /$i /mnt/$i; done
sudo cp -n /etc/resolv.conf /mnt/etc/
sudo chroot /mnt
apt install --reinstall linux-image-generic linux-headers-generic
update-initramfs -c -k all
exit
sudo bootctl --path=/mnt/boot/efi install
reboot

# Consider re-installing "refind" for convenience, but perhaps it's related to the problem...