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I am completely new in Ubuntu. I want to write Bootable Image of Ubuntu on SD Card. This is what I have done

1- I have downloaded the base Ubuntu and build my own ubuntu "ubuntu_rootfs.tar.gz"
2- Create an ext4 file system named ubuntu.ext4 with dd command   "dd if=/dev/zero of=ubuntu18_rootfs.ext4 bs=1297M count=3"
3- format ubuntu.ext4 as EXT4 file System
4- create a temporary Folder rootfs_tmp
5- mount the ubuntu.ext4 in rootfs_tmp
6- untar the "ubuntu_rootfs.tar.gz" into rootfs_tmp
7- umount the rootfs_tmp

but what if I want yo have the built Ubuntu on a real SD Card? is it possible to have a SD Card as a ext4 file system ?

nnmmss
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  • I love reinventing the wheel myself sometimes. For a simple method of puttin the Full install of Ubuntu on a SD card see: https://askubuntu.com/questions/1300454/easy-full-install-usb-that-boots-both-bios-and-uefi. For a more traditional method of putting the Full install on a SD card see: https://askubuntu.com/questions/1217832/how-to-create-a-full-install-of-ubuntu-20-04-to-usb-device-step-by-step. To build a Persistent Live SD card from scratch see: https://askubuntu.com/questions/1227221/simple-hand-made-persistent-usb-that-boots-either-bios-or-uefi. – C.S.Cameron Jul 15 '21 at 05:40
  • Or you can directly boot ISO files with a Persistent partition: https://askubuntu.com/questions/1269462/bios-uefi-template-image-for-booting-iso-files. – C.S.Cameron Jul 15 '21 at 05:40

1 Answers1

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Blockquote but what if I want yo have the built Ubuntu on a real SD Card? is it possible to have a SD Card as a ext4 file system ?

I have not tried what you are trying... but I have formatted a microSD card into Ext4 to test if my android tablet would support it. So yes, you can format an SD card into ext4

Good luck!

user1366177
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  • It would eventually be good to add that putting such "heavy" filesystem on an SD card is typically not the optimal way to go. But yes, one can simply put any file system on an SD card as on any other storage medium. – vanadium Jul 15 '21 at 07:03
  • @vanadium 'such "heavy" filesystem on an SD card'... It depends... with the size and speed of SD cards these days... FAT32 is great for smaller files on a smaller SD cards... but on a 2Tb SD card? (Sure... there's exFAT... but there are cases where ext4 has advantages...) – user1366177 Jul 16 '21 at 00:49
  • I didn't know such large SD cards existed. Still thinking in terms of 64 GB ;) – vanadium Jul 16 '21 at 07:18