I cane across the solution when installing Virtual box on Ubuntu but got the old
modprobe: ERROR: could not insert 'vboxdrv': Required key not available
I was having the same issue with my r8152 drivers for my Lenovo Thunderbolt 3 dock
This(https://forums.lenovo.com/t5/Linux-Discussion/X1-5th-and-Thundebolt3-dockstation-no-ethernet-with-Debian/td-p/3730394) article got me 90% of the way to a solution but I wasn’t able to load the driver.
The soltuion was fialry simple.
Create a key, trust the key, use the key to sign the driver, reboot, Import the key during the MOK management boot screen, reboot, modprobe the driver, All good :)
When developing on an ESP8266 I came across the issue of the WDT not being triggered by my code and subsequently getting reset by the hardware WDT.
Here is one of the few useful resources I found on the topic – https://techtutorialsx.com/2017/01/21/esp8266-watchdog-functions/
Essentially it’s as simple as adding
ESP.wdtFeed(); to your loop to reset the WDT so it doesn’t time out and get rebooted.
No questions asked reboot.
Danger Will Robinson, will most likely break many things!
echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger
Original article – https://major.io/2009/01/29/linux-emergency-reboot-or-shutdown-with-magic-commands/