I have a flash drive, whose information given by
sudo fdisk -l is
Device Boot Start End Sectors Size Id Type /dev/sdb1 1 7864319 7864319 3.8G c W95 FAT32 (LBA)
I would like to know how I can use the flash drive for two things simultaneously:
a bootable flash drive for Lubuntu 18.04, which is 1GB
for storing temporary personal files.
Originally I created a bootable flash drive for Lubuntu 18.04, by
dd /path/to/ubuntu.iso /dev/sdb
After installing Lubuntu to my laptop, I didn't know how I could continue to use the flash drive as temporary storage of other personal files, so I asked how to revert the flash drive back to a storage device for my other personal files only, and followed the reply there to change my flash drive to be what I have shown at the beginning of this post.
Now I think that in case that my Lubuntu can't boot for whatever reason, I still need to run the OS on a bootable flash drive to retrieve the files on the file systems on my laptop. So here I am asking how I can create a bootable flash drive for Lbuntu and also store temporarily other personal files in the same flash drive.