(SOLVED) Linux Mint not appearing in boot menu on UEFI system

[witherlikeslinux]

I am aware that similar questions have been asked on this forum (and other sites) before, though none of the solutions these sites have offered have worked for me. As the title suggests, I have installed Linux Mint, but it isn't popping up in the boot menu. I have tried using grub-update and boot-repair. Secure boot is turned off, and there is no option to switch between UEFI/Legacy in my BIOS' settings. I am not worried about losing any data as I have backed all the files I need from the previous OS I was running on this laptop (Windows 10, which has been formatted).

Thank you in advance for any help.

inxi -Fxxxrz output:

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System:
  Kernel: 5.4.0-91-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 
  Desktop: Xfce 4.16.0 tk: Gtk 3.24.20 info: xfce4-panel wm: xfwm4 
  dm: LightDM 1.30.0 Distro: Linux Mint 20.3 Una base: Ubuntu 20.04 focal 
Machine:
  Type: Laptop System: Acer product: Aspire ES1-132 v: V1.26 
  serial: <filter> Chassis: type: 10 serial: <filter> 
  Mobo: Acer model: Ornith_AP v: V1.26 serial: <filter> UEFI: Insyde v: 1.26 
  date: 05/03/2018 
Battery:
  ID-1: BAT1 charge: 10.2 Wh condition: 12.2/36.7 Wh (33%) volts: 12.1/11.3 
  model: LGC AC14B18J type: Li-ion serial: <filter> status: Charging 
CPU:
  Topology: Dual Core model: Intel Celeron N3350 bits: 64 type: MCP 
  arch: Goldmont rev: 9 L2 cache: 1024 KiB 
  flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 4377 
  Speed: 796 MHz min/max: 800/2400 MHz Core speeds (MHz): 1: 830 2: 835 
Graphics:
  Device-1: Intel HD Graphics 500 vendor: Acer Incorporated ALI driver: i915 
  v: kernel bus ID: 00:02.0 chip ID: 8086:5a85 
  Display: x11 server: X.Org 1.20.11 driver: modesetting 
  unloaded: fbdev,vesa resolution: 1366x768~60Hz 
  OpenGL: renderer: Mesa Intel HD Graphics 500 (APL 2) v: 4.6 Mesa 21.0.3 
  direct render: Yes 
Audio:
  Device-1: Intel Celeron N3350/Pentium N4200/Atom E3900 Series Audio Cluster vendor: Acer Incorporated ALI driver: snd_hda_intel v: kernel 
  bus ID: 00:0e.0 chip ID: 8086:5a98 
  Sound Server: ALSA v: k5.4.0-91-generic 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Acer Incorporated ALI driver: r8169 v: kernel port: 1000 
  bus ID: 02:00.0 chip ID: 10ec:8168 
  IF: enp2s0 state: down mac: <filter> 
  Device-2: Intel Dual Band Wireless-AC 3168NGW [Stone Peak] driver: iwlwifi 
  v: kernel port: 1000 bus ID: 03:00.0 chip ID: 8086:24fb 
  IF: wlp3s0 state: up mac: <filter> 
Drives:
  Local Storage: total: 480.08 GiB used: 10.60 GiB (2.2%) 
  ID-1: /dev/sda vendor: Western Digital model: WD5000LPCX-21VHAT0 
  size: 465.76 GiB speed: 6.0 Gb/s rotation: 5400 rpm serial: <filter> 
  rev: 1A01 temp: 40 C scheme: GPT 
  ID-2: /dev/sdb type: USB vendor: SanDisk model: Ultra USB 3.0 
  size: 14.32 GiB serial: <filter> rev: 1.00 scheme: MBR 
Partition:
  ID-1: / size: 1.84 GiB used: 154.0 MiB (8.2%) fs: overlay source: ERR-102 
Sensors:
  System Temperatures: cpu: 52.0 C mobo: N/A 
  Fan Speeds (RPM): N/A 
Repos:
  Active apt repos in: /etc/apt/sources.list 
  1: deb cdrom:[Linux Mint 20.3 _Una_ - Release amd64 20220104]/ focal contrib main
  Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
  1: deb http://packages.linuxmint.com una main upstream import backport #id:linuxmint_main
  2: deb http://archive.ubuntu.com/ubuntu focal main restricted universe multiverse
  3: deb http://archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
  4: deb http://archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse
  5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
  6: deb http://archive.canonical.com/ubuntu/ focal partner
Info:
  Processes: 184 Uptime: 32m Memory: 3.68 GiB used: 1.47 GiB (40.0%) 
  Init: systemd v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 9 Shell: bash 
  v: 5.0.17 running in: xfce4-terminal inxi: 3.0.38

efibootmgr -v output:

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BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 0005,2001,2002,2003
Boot0000* Unknown Device: 	HD(1,GPT,949fd555-6eee-4824-823b-b9307cac1723,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)RC
Boot0001* USB HDD: SanDisk	PciRoot(0x0)/Pci(0x15,0x0)/USB(3,0)/HD(1,MBR,0x880e3c0,0x800,0x1ca3800)RC
Boot0002* Unknown Device: 	HD(1,GPT,c6e80c00-bf34-4484-a31e-85752fd559f4,0x800,0x100000)/File(\EFI\android\bootx64.efi)RC
Boot0005* ubuntu	HD(1,GPT,949fd555-6eee-4824-823b-b9307cac1723,0x800,0x100000)/File(\EFI\ubuntu\shimx64.efi)
Boot2001* EFI USB Device	RC
Boot2002* EFI DVD/CDROM	RC
Boot2003* EFI Network	RC

[deepakdeshp]

Efibootmgr output looks good. Enter BIOs and in boot menu ubuntu should be the first entry.

[MiZoG]

The entry to boot Linux is there. Most motherboards come with the UEFI option to select "BBS priorities" (or something) for each bootable drive. Have you checked? When you detach your external drive, what drive / os your system boots?

[witherlikeslinux]

Efibootmgr output looks good. Enter BIOs and in boot menu ubuntu should be the first entry.

I apologize, as I have forgotten to mention that I previously installed Ubuntu on this laptop before Windows 10, which may be why it appears on efibootmgr's output, though it is no longer on this laptop.

The entry to boot Linux is there. Most motherboards come with the UEFI option to select "BBS priorities" (or something) for each bootable drive. Have you checked? When you detach your external drive, what drive / os your system boots?

I tried booting it again with the "ubuntu" entry on the top of the list and the live CD disconnected, but got the same result as before: a screen telling me that it can't detect any bootable devices:

[MiZoG]

Android entry in UEFI... Fancy boot error screen.Cannot be a chromebook, right? Never had one. Have you installed Androidx86 or other android-emulation stuff which could alter your Linux installation?

[witherlikeslinux]

Android entry in UEFI... Fancy boot error screen.Cannot be a chromebook, right? Never had one. Have you installed Androidx86 or other android-emulation stuff which could alter your Linux installation?

It's an Acer Aspire ES1-132. You can find the rest of the specifications for this laptop on my first post in this topic. I did try dualbooting PrimeOS, an android emulator, with Ubuntu about a month or two ago but I gave up. I'm not sure why those entries are appearing in the boot list since neither OSes are present on my device.

[senjoz]

Check this topics. Maybe it will help you.

[witherlikeslinux]

Check this topics. Maybe it will help you.

Unfortunately, this did not help as well. While the setup utility of my laptop is exactly the same as the one mentioned in the topic you've linked (InsydeH2O Setup Utility Rev 5.0), the versions are different (v1.26). This may be the reason that a "register a new UEFI file as trusted" option did not appear in my BIOS after setting a supervisor password.

[JeremyB]

Might want to take a look at viewtopic.php?p=1657666#p1657666

[witherlikeslinux]

Might want to take a look at viewtopic.php?p=1657666#p1657666

I don't know how I missed this post while looking for a solution. Thank you so much, it worked perfectly! :]