I want to install Debian directly onto my USB drive. Is there an easy way to do this directly without having to reboot to run the installer?
Buy an external ssd or an internal one with an enclosure.
Don’t do that
You can but it will be very slow and your drive will die quickly. Alternatively you could make a USB drive with MX Linux and then only save what you need.
If the system you have has enough RAM you could load the entire OS to RAM and then change the writeback settings to a high interval
dunno, the system might ran out of RAM due to lack of swap, but the drive should be fine due to the limited writes
Yes. Just partition the drive manually, install packages with debootstrap, bind-mount /proc, /sys and /dev, chroot into it and install a bootloader. If you don’t understand what I say, you have to run an installer, possibly in a VM.
directly onto my USB
directly without having to reboot to run the installer?
You use “directly” three times. Remove all instances of the word from your post and reread it. Does the post make sense to you still? Does it have the same meaning?
I am not trying to be a dick, I want to make sure the word does not have a meaning I am not aware of in this context or if Linux is installable to a USB drive ‘indirectly’ but that does not make sense to me.
Can you rephrase what you are trying to do?
I want to install Debian on the USB drive from my currently running OS, Manjaro Linux.
I don’t want to have to boot from Debian installation media to install it on the USB drive.
I am using Manjaro as well.
Are there Debian apps that you want to run but are unable to because Manjaro is Arch-based? I have read that it is not recommended to install programs compiled for Debian, that it is difficult to run them. Using a virtual machine is the recommended way to use them. Asking just in case but I do not think this is what you want.
Computers can only run one operating system at a time, unless you use virtual machines and hypervisors. Most operating systems are launched after the system uses a bootloader to get the system ready for the operating system. This is usually done by the BIOS/UEFI/firmware starting a bootloader, which then launches the operating system.
If you want a USB that you can plug into a machine that is already running, that has an active operating system like Manjaro or Windows or whatever, then have it start running Debian, like you would an Appimage or a Windows .exe program saved to a USB, that is not possible except maybe with a virtual machine program like Virtual Box or Qemu.
USB drives were not intended to be used as drives that run operating systems. It can be done, but it is not simple and can cause a lot of errors.
What do you need the USB for? If you can explain what you are trying to achieve with more detail, there might be ways to do it differently.
