this post was submitted on 19 Feb 2025
514 points (100.0% liked)
Privacy
34089 readers
709 users here now
A place to discuss privacy and freedom in the digital world.
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
Some Rules
- Posting a link to a website containing tracking isn't great, if contents of the website are behind a paywall maybe copy them into the post
- Don't promote proprietary software
- Try to keep things on topic
- If you have a question, please try searching for previous discussions, maybe it has already been answered
- Reposts are fine, but should have at least a couple of weeks in between so that the post can reach a new audience
- Be nice :)
Related communities
much thanks to @gary_host_laptop for the logo design :)
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Just use
dd. It's not that hard. You pass it 2 arguments:if=the file you want to flash, andof=the destination. If you're feeling fancy, pass in somestatus=progress. And don't forget to prepend it withsudo. That's it.I just tried this the other day and was unable to boot from the USB. Any chance you could shed some light on what I might have screwed up?
The command was:
The USB stick was not mounted and the fedora image was verified. The command completed successfully but I couldn't boot from it. When I used fedora writer to burn the same image to the same USB stick it booted no problem.
Edit: spelling & capitalization
Don't use Fedora myself, but it may not be a hybrid ISO that becomes bootable when written... so I looked and you are missing a flag
From https://docs.fedoraproject.org/en-US/quick-docs/creating-and-using-a-live-installation-image/
Ah! Thank you! I knew it was something I screwed up!
You didn't screw up, you beautifully proved why the CLI is never a simple solution.
It reminded me when I told a coworker he could force the Windows shutdowns with the command 'shutdown -p -f" from either a Run.exe or a cmd window.
Then he said it wasn't working, and that the cmd window would just open and close quickly but no shutdown.
Imagine my surprise when he was doing shutdown -pf .
This is why people trying to pass this as a primary option baffle me a bit. dd is not that bad in isolation, but all of these little commands add up.
If we want Linux to be mainstream, we need to accept that most users aren't going to be linux enthusiasts. They just want a PC that works normally.
I don't think
oflags=directhas any influence on the result. Apparently that's about disabling the page cache in the kernel, which can avoid a situation in which the system slows down due to buildup yet-to-write pages.Perhaps not. But the flag allows for direct I/O for data, bypassing buffers which can be overrun with certain size blocks, potentially causing dirty buffer depending on the machine being used. My understanding is that it's "more reliable" for writing (especially on shitty USB Flash drives) and getting the exact ISO properly written.
But it could be useless all the same - I'm just pointing out that OPs command is not the one recommended by Fedora when writing their ISO. Also OP is less likely to pull the drive before buffers have flushed this way.
Oh yeah that's where I was getting at, but I didn't have time to write that out earlier. I agree that OP probably pulled out the usb stick before buffers were flushed. I imagine that direct I/O would mitigate this problem a lot because presumably whatever buffers still exist (there would some hardware buffers and I think Linux kernel I/O buffers) will be minimal compared to the potentially large amount of dirty pages one might accumulate using normal cached writes. So I imagine those buffers would be empty very shortly (less than one second maybe?) after dd finishes, whereas I've seen regular dd finish tens of seconds before my usb stick stopped blinking it's LED. Still if you wait for that long the result will be the same.
Did you make sure that the
ofis correct?lsblkto make sure.If your sure it wrote to the right drive i would make sure that you have a good download. Did you run your checksums?
I think fedora works with secureboot but you might want to disable it just to see if that is the issue. I believe you can reenable it after install.
Make sure to go into the bios and boot from external drive/usb.
Out of 15 years of using
ddi have never had a problem.I did verify with
lsblk, with a listing before and after plugging in the stick to be absolutely sure.I also did verify the checksum of the ISO.
I'll double check SecureBoot, but as I mentioned, the same ISO written to the same stick with Fedora writer did boot in the same machine it wouldn't boot from with the
ddversion.I know it's something I did or didn't do to make it work correctly, so this is not me trying to dunk on
dd, just trying to understand what I did wrong.You might not have done anything wrong.
There is also the possibility of a bad USB drive or write memory failure. There is lots of things that could go wrong that's not your fault. Might try a different USB or a different USB port on your machine.
You might want to try zeroing out the USB,
if=/dev/zero. Then you might need to make a new partition table. You can use something like gparted. Or https://linuxconfig.org/how-to-manipulate-partition-tables-with-fdisk-cfdisk-and-sfdisk-on-linuxYou can try GPT or DOS. I dont think it matters.
Not sure if the ISO will have the partition table so you might want make the new partition table just to be sure the stick defiantly has one. If dd overwrites it from the iso no harm no foul.
Thats all the troubleshooting steps I can think of right now.