14
votes
Accepted
How do I reset the lost password of a Pi 4 running Ubuntu server?
I would put the sd card into another machine, mount the disk and edit the file /etc/shadow to remove the password; delete the characters between the first and second colons in the file. Save the file ...
- 458
8
votes
Accepted
What is the default cmdline.txt for Raspberry Pi 4
On my Pi 4, it's:
console=serial0,115200 console=tty1 root=PARTUUID=XXXXXXXX-02
rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait quiet
splash plymouth.ignore-serial-consoles
Your PARTUUID ...
- 1,050
6
votes
Change/reset password WITHOUT monitor/keyboard
You don't have to create a temporary user on a different system to generate a password hash. You can do it without root access by running:
openssl passwd -salt "salt" "password"
...
- 28.2k
4
votes
Accepted
What is the difference between adding 'ro' to /boot/cmdline.txt vs /etc/fstab?
It has to do with how the kernel initially mounts the root filesystem. According to the Linux kernel user’s and administrator’s guide, there are both ro and rw parameters:
ro [KNL] ...
- 156
3
votes
How do I regain access to either the filesystem or terminal on a raspberry pi that has all networking services disabled and no terminal?
Try adding rw init=/bin/bash to the cmdline.txt: that should unconditionally boot your system into a root terminal, which allows you to edit the configuration files you have messed up (re-enabling the ...
- 28.2k
3
votes
Accepted
How do I regain access to either the filesystem or terminal on a raspberry pi that has all networking services disabled and no terminal?
Your SD card (or whatever media you boot from) has two partitions - one is ext4 filesystem (/); the other is FAT32 filesystem (/boot). You may remove the SD card, then mount and edit anything in /boot ...
- 22.9k
3
votes
Disabling rainbow splash screen does not work
Yes, but for the Raspberry Pi 3 model B, add the line:
disable_splash=1
to the file:
/boot/config.txt
is not hiding the splash screen with Raspbian Jessie
- 39
2
votes
As of the current date, what is the default /boot/config.txt
Here's my cmdline.txt file from my 3B+ stretch RPi:
dwc_otg.lpm_enable=0 console=tty1 console=serial0,115200 root=PARTUUID=bb8517b1-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
...
- 22.9k
2
votes
cmdline.txt appears to be empty after editing it
You can see what the kernel has used as /boot/cmdline.txt by cat /proc/cmdline there's some stuff there that's merged in by the bootcode.
If you're using NOOBS (or PINN) the command line you're ...
- 5,353
2
votes
Disabling rainbow splash screen does not work
Seems like there is no way to get around the rainbow screen unless you switch to another bootloader. Checked from github and found the issue is been already addressed. This is a bug require fixing. Or ...
2
votes
Disabling rainbow splash screen does not work
For NOOB you need copy config.txt with command disable_splash=1 to recovery partition.
cd /boot
sudo mkdir /media/recovery
sudo mount /dev/mmcblk0p1 /media/recovery/
sudo cp config.txt /media/...
- 21
2
votes
Accepted
First Boot expand filesystem does not take effect
by posting this thread, I got the answer for my own question. So now here is my solution!
I saw that the /etc/init.d/resizefs_once script and /etc/rc3.d/S01resize2fs_once is missing, which is build ...
- 121
2
votes
Accepted
Why does /dev/mmcblk0p2 work when PARTUUID doesn't?
The root= field from cmdline.txt specifies to the kernel where the partition with the root filesystem is. There are a few ways that can be specified. The one that is generally preferred in the linux ...
- 60.1k
2
votes
How do I reset the lost password of a Pi 4 running Ubuntu server?
Mount it on another rpi(or any linux box with qemu-user-static installed).
mount --bind the /dev /sys and /proc directories.
chroot into it.
References:
https://wiki.debian.org/QemuUserEmulation
https:...
- 121
1
vote
Forcing HDMI output on Bookworm
If both arandr and Setting your display’s resolution and rotation as noted in the Raspberry pi documentation and adding "video=HDMI-A-1:1920x1080@60" to /boot/cmdline.txt options do not work,...
- 111
1
vote
Accepted
Connect a RPi with static IP (cmdline.txt: ip=169.254.0.xx i.e. APIPA range), but without 120 seconds waiting time if no ethernet cable
This question contains a lot of incorrect detail.
169.254.0.0/16 is a Link-local address (also occasionally called APIPA) but there is NO point in attempting to assign one as there will already be one ...
- 61.5k
1
vote
how to prevent rpi4 s to overwrite the cmdline.txt
At least one answer here suggests that the code that parses /boot/cmdline.txt is picky. AIUI, /boot/cmdline.txt contains a single command line, only the first line of the file is read and parameters ...
- 22.9k
1
vote
What is the difference between adding 'ro' to /boot/cmdline.txt vs /etc/fstab?
The difference is mainly that cmdline is related to kernel command line (ie parameters to pass to kernel boot) as opposite to /etc/fstab which is related to your operating system.
- 111
1
vote
fsck.mode=force is not fixing unable to mount root fs on unknown-block(179,2)
To repair the filesystem you need the programs fsck.*. These are located on the root partition. Do you already see the problem?
You have repaired the filesystem on the first SD Card by using the fsck....
- 42.7k
1
vote
Mount the FAT32 partition of the SDCard of which RPi is booting to edit cmdline.txt
yes you can mount the fat partition for temporarly reasons, otherwise use fstab
sudo mount -t vfat -o uid=root /dev/mmcblk0p1 /mnt
sudo nano /mnt/cmdline.txt
have fun
- 111
1
vote
Disabling rainbow splash screen does not work
For me on Raspbian GNU/Linux 9 (Stretch) these modifications are working for making an absolute silent boot (boot to CLI):
In /boot/cmdline.txt change the console from tty1 to console=tty3.
You'll ...
- 11
1
vote
Accepted
raspbian stretch overrides cmdline.txt kernel.hostname parameter
If the kernel option in /boot/cmdline.txt does not work you can use the DHCP server. It has an option to send the hostname within its lease for the device. This is the usual way for a centralized ...
- 42.7k
1
vote
raspbian stretch overrides cmdline.txt kernel.hostname parameter
Use the NFS format for the ip parameter instead.
ip=::::hostnamegoeshere:eth0:dhcp
If the DHCP server agrees, it should respond with a hostname field as well and potentially update DNS (that's what ...
- 111
1
vote
raspbian: unable to mount root fs on uknown block
If you are actually trying to install a new Raspbian image follow the instructions in https://www.raspberrypi.org/documentation/installation/installing-images/README.md
If this does not apply you ...
- 61.5k
1
vote
Where is the cmdline.txt on Windows IOT Dashboard installation?
Are you sure these files are relevant? The instructions you are following are for a Linux based Raspberry Pi (/dev/ttyAMA0 and /etc/inittab are both Linux device/file names).
I wouldn't have thought ...
- 71.7k
1
vote
cmdline.txt changes are discarded when ejecting sd card
To change password login to the Pi and use the Raspberry Pi Configuration menu in GUI or raspi-config from the command line.
Alternatively you could use the passwd command.
It is not impossible to ...
- 61.5k
1
vote
How do I set the Dvorak keyboard layout in cmdline.txt?
Setting the keyboard from cmdline.txt probably isn't ideal, and you would be better off using raspi-config, particularly if you use a GUI, because I believe the keyboard used there maybe configured ...
- 60.1k
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