Execute the following commands using a LiveCD:
sudo mount /dev/sdXY /mnt
sudo mount /dev/sdXX /mnt/boot/efi
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
sudo chroot /mnt
grub-install /dev/sdX
update-grub
Note that X and Y are only used as an example. E.g. it can be that the EFI system partition is on a completely different disk (hard drive) than the Linux system, which needs to be repaired.
Saturday, July 11, 2020
Thursday, August 30, 2018
Turning off LEDs on Raspberry Pi 3 Model B
I found the solution here: https://raspberrypi.stackexchange.com/questions/70593/turning-off-leds-on-raspberry-pi-3 and it works for Raspberry Pi 3 Model B too. The following lines should be added to /etc/rc.local:
sudo sh -c 'echo none > /sys/class/leds/led0/trigger'
sudo sh -c 'echo none > /sys/class/leds/led1/trigger'
sudo sh -c 'echo 0 > /sys/class/leds/led0/brightness'
sudo sh -c 'echo 0 > /sys/class/leds/led1/brightness'
The other method with /boot/config.txt didn't work for me.
sudo sh -c 'echo none > /sys/class/leds/led0/trigger'
sudo sh -c 'echo none > /sys/class/leds/led1/trigger'
sudo sh -c 'echo 0 > /sys/class/leds/led0/brightness'
sudo sh -c 'echo 0 > /sys/class/leds/led1/brightness'
The other method with /boot/config.txt didn't work for me.
Friday, December 8, 2017
Multiple WiFi Networks with Raspberry Pi
All of this information (and more) is available on https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md.
All the WiFi network credentials should be listed in this file: /etc/wpa_supplicant/wpa_supplicant.conf. It should look like this:
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=DE
network={
ssid="ssid1"
psk="plaintextpassword1"
key_mgmt=WPA-PSK
}
network={
ssid="ssid2"
psk="plaintextpassword2"
key_mgmt=WPA-PSK
}
Some additional useful commands:
All the WiFi network credentials should be listed in this file: /etc/wpa_supplicant/wpa_supplicant.conf. It should look like this:
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=DE
network={
ssid="ssid1"
psk="plaintextpassword1"
key_mgmt=WPA-PSK
}
network={
ssid="ssid2"
psk="plaintextpassword2"
key_mgmt=WPA-PSK
}
Some additional useful commands:
- List all available WiFi networks:
iwlist wlan0 scan
- Generate encrypted password: wpa_passphrase
- Reconfigure the interface: wpa_cli -i wlan0 reconfigure
- Verify if the connection was successful: ifconfig wlan0
Friday, May 26, 2017
A Reschenpass Körül
Az Ortler Bike Marathon pályáját jártuk be. Kicsit sok benne az aszfaltos rész, több helyen viszont egyáltalán nem tekerhető, főleg fölfelé. Lefelé csak egyszer kellett leszállni. :)
A Haidersee St. Valentin felől |
Kempinghangulat |
Schloss Churburg |
Régi templomtorony a Reschensee-ben, már a célegyenesben... |
Kilátás a kempingből |
A még havas Ortler |
St. Valentin utcáin |
Monday, May 1, 2017
Wednesday, December 28, 2016
Sony HDR-AS200V - "MAX"
I'm using the timelapse function very often with this particular camera and today I ran into one of the limitations of this feature. I just started a new timelapse and a weird "MAX" error message started to blink on the screen... Strangely, there is an upper limit, how many photos you can take with the camera: "The maximum number of files that can be recorded has been reached". The limit is 40.000 photos, which can be easily exceeded with a large enough SD card. The only workaround I found is removing the contents of the AVF_INFO directory or formatting the SD card.
Sunday, November 6, 2016
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