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Andy

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Pop!_OS uses kernelstub to manage the boot parameters and kernel images, instead of GRUB.

Follow the commands below to disable boot splash screen and show the boot verbose on:
Bash:
sudo kernelstub --print-config

Rich (BB code):
andy@ws:~$ sudo kernelstub --print-config
[sudo] password for andy:
kernelstub.Config    : INFO     Looking for configuration...
kernelstub           : INFO     System information:

    OS:..................Pop!_OS 20.04
    Root partition:....../dev/sda3
    Root FS UUID:........2f2b0cdf-3432-42bf-8b7e-c2387e2b4a8f
    ESP Path:............/boot/efi
    ESP Partition:......./dev/sda1
    ESP Partition #:.....1
    NVRAM entry #:.......-1
    Boot Variable #:.....0000
    Kernel Boot Options:.quiet loglevel=0 systemd.show_status=false splash
    Kernel Image Path:.../boot/vmlinuz-5.4.0-7634-generic
    Initrd Image Path:.../boot/initrd.img-5.4.0-7634-generic
    Force-overwrite:.....False

kernelstub           : INFO     Configuration details:

   ESP Location:................../boot/efi
   Management Mode:...............True
   Install Loader configuration:..True
   Configuration version:.........3

andy@ws:~$

As we can see the kernelstub config above, there's quiet, systemd.show_status=false and splash option on the Kernel Boot Options.

Use the command below to remove them:
Bash:
sudo kernelstub --delete-options "quiet systemd.show_status=false splash"
And use the command below to show the boot verbose:
Bash:
sudo kernelstub --add-options "systemd.show_status=true"

And if we print the kernelstub config again, the quiet and splash option has now been cleared with the systemd.show_status value now sets to true:
Rich (BB code):
andy@ws:~$ sudo kernelstub --print-config
kernelstub.Config    : INFO     Looking for configuration...
kernelstub           : INFO     System information:

    OS:..................Pop!_OS 20.04
    Root partition:....../dev/sda3
    Root FS UUID:........2f2b0cdf-3432-42bf-8b7e-c2387e2b4a8f
    ESP Path:............/boot/efi
    ESP Partition:......./dev/sda1
    ESP Partition #:.....1
    NVRAM entry #:.......-1
    Boot Variable #:.....0000
    Kernel Boot Options:.loglevel=0 systemd.show_status=true
    Kernel Image Path:.../boot/vmlinuz-5.4.0-7634-generic
    Initrd Image Path:.../boot/initrd.img-5.4.0-7634-generic
    Force-overwrite:.....False

kernelstub           : INFO     Configuration details:

   ESP Location:................../boot/efi
   Management Mode:...............True
   Install Loader configuration:..True
   Configuration version:.........3

andy@ws:~$

Use the command below:
Bash:
sudo kernelstub --delete-options "systemd.show_status=true"
sudo kernelstub --add-options "quiet systemd.show_status=false splash"
If you have any questions or comments, feel free to post them down below 👇
 
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