Questions[disk-formatting](ubuntu)

I had tried in vain to install Debian (which didn't work) and after that I have installed Ubuntu with LVM. Now I still have the boot entry for both OS (F7 key on startup). Both OSes were installed by using LVM-encryption and encryption.

As suggested I installed grub-customizer, which looks like this:

No mention of Debian there. How can I get rid of this entry?

Output of efibootmgr:

nuc@nuc:~$ sudo efibootmgr
[sudo] Passwort für nuc: 
BootCurrent: 0001
Timeout: 1 seconds
BootOrder: 0001,0004,0002,0003
Boot0001* ubuntu
Boot0002* UEFI: PXE IPv4 Intel(R) Ethernet Connection (10) I219-V
Boot0003* UEFI: PXE IPv6 Intel(R) Ethernet Connection (10) I219-V
Boot0004* debian

I'm trying to partition my 2nd 1 TB hard drive but I get this error in GNOME Disks app:

Error creating partition
Don't know how to create partitions
This partition table of type `atari' (udisks-error-quark, 0)

I realized it doesn't support "MSDOS" disks, and it says i have to change it, but how?? The format partition option is grayed out.

What is the best way to format a USB stick such that it can be used with both Linux and Windows 10?

Also what is the best practice for formatting a USB stick? Is it best to format the USB stick only for Linux use rather than for both Linux and Windows use?

I am new to Linux and I am using Ubuntu 20.04.

Would appreciate exact steps to follow.

30 minutes ago I plugged in an external storage device and asked Ubuntu to format it. After I made this query, Ubuntu closed the window I was in and doesn't show anything related to the formatting process (I was expecting a progress bar or something like that).

I tried to shut down and restart Ubuntu, but without success. Then I thought that Ubuntu refused to shut down or restart the computer because maybe the formatting is happening in the background somehow. Right now my external drive is blinking, which may mean that this is being formatted, but I'm not sure.

How can I see if the formatting process is happening when there is no progress bar showing up?

Thanks in advance!

I have a new 2TB external hard drive I will be using for additional storage and backup. I will only use it on two Ubuntu machines. Is it recommended to format the drive to ext4? Are there any advantages in doing so?