Questions tagged [kernel]

Questions concerning the Linux kernel in Ubuntu. Issues may including upgrading and installing kernels, compiling, patches, and kernel modules.

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controlling gpio on Ubuntu 20.04 64 bit arm Raspberry Pi

I wrote a program in C which uses the gpio pins on a Raspberry Pi. When I wrote the program, it ran fine on Ubuntu 18.04 armhf (32 bit). Now, however, on my Raspberry pi 4, running Ubuntu 20.04 arm64, ...
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Why does dkms status “WARNING! Diff between built and installed module” happen?

generic@motorbrot:~$ sudo dkms status zfs, 0.8.4, 5.3.0-51-generic, x86_64: installed (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!) (WARNING! ...
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install previous hwe kernel

Can someone give some hints how to solve the problem the essence: Ubuntu 18.04. LTS guest VM machine. initially boot gives an error Couldn't get size: 0x800000000000000e but boots, and in HYPER-V ...
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lirc_serial module missing 18.04+

On Unbuntu 20.04, I want to configure lirc for IR blasting over serial port. But it seems that the latest linux kernel is missing the necessary "lirc_serial.ko" module (missing since Linux 4.15, at ...
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Watchdog daemon does not touch /dev/watchdog

I am running ubuntu 16.04. I have installed both softdog kernel module and the watchdog daemon, and hoping to get a software watchdog behaviour running. I run the following command to load softdog... ...
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Open vSwitch installation fails - SSL error:02001002:system library:fopen:No such file or directory:

I am installing OVS v2.7.0 on Ubuntu 14.04 with kernel version 4.4.0-142-generic (you can check the compatibility here) from source. git clone https://github.com/openvswitch/ovs cd ovs git checkout ...
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How do I use the softdog module?

I am trying to use the software watchdog kernel module called softdog. I am not sure how to use it properly. I have removed the module from ... /etc/modprobe.d/blacklist-watchdog.conf Then I have ...
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I Tried to Update the Kernel?

I tried to update my Ubuntu 20.04 kernel but seemed to have found myself with these latest errors. What's the solution? frederick@frederickpina:~$ sudo apt-get install -f [sudo] password for ...
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I cant install old nvidia driver after kernel update

i upgraded my ubuntu to 20.04 and the kernel to 5.4.0-33 , and now i cant install 390.87 nvidia driver and i can install only 390.132 my gpu : NVIDIA GeForce GT 610 my gaming performance is better on ...
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how to install newly generated ubuntu kernel .deb files?

I tried building ubuntu from the source following BuildYourOwnKernel page. (https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel by the way, the page needs some fix now) I did it on a virtual machine ...
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Multiple kernel errors after updating to newest kernel

So kernel 5.7 has a fix for my headphones' mic not being detected. However, when booting into the kernel I get the following errors nvidia-gpu 0000:01:00.3: i2c timeout error e000000 ucsi_ccg 0-ooo8:...
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Kernel - make menuconfig error

Working with a Headless Raspberry PI 4 with an Ubuntu Server 18.04.4 LTS.. I am trying to configure the source kernel. I have installed libncurses-dev, kernel-package, qt4-dev-tools. When I run '...
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How use olicard 600 in Ubuntu?

I'm trying to use Olivetti Olicard 600 on my Ubuntu 18.04 with kernel 5.4, but it doesn't work on my notebook even using a newer kernel. I see that already exists a PATCH about it: https://www....
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Ubuntu 16.04 VMware Kernel headers for 4.4.0 were not found

I have a Linux system with the kernel "4.4.0" but nothing else. Not "4.4.0-1008" or something else, only "4.4.0" and I doesn't find any linux-headers for the version "4.4.0" (remember: the version is ...
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Error while installing “linux-headers-5.4.0-33-generic” and “linux-image-5.4.0-33-generic”

Today I got ubuntu updates which also included linux kernal updates. So I did sudo apt-get upgrade to install them. Some packages were installed followed by this error. /etc/kernel/postinst.d/dkms: *...
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apt-get source linux-image-$(uname -r) doesn't seem to download the kernel source [duplicate]

I was following this link : https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel In the middle, I ran command below as it told me to apt-get source linux-image-$(uname -r) The uname -r command gives me ...
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Ubuntu 20.04 on ZFS can't update kernel, bpool missing

Symptoms Kernel doesn't update. That is after restart, the system is still on the old kernel. Changes to GRUB config aren't applied. Installing a new kernel isn't applying. bpool is missing due to ...
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How can I use my usb-c equipped laptop in device (gadget) mode?

I've recently "mousetrapped" my old trusty laptop and bought a new one. And it has a USB type C port on a side. I bought a USB OTG converter, so I can use it in HOST mode. However it should be a dual-...
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Ubuntu boot error : failed vce resume error while loading shared libraries : libc.so.6

Ubuntu fails to boot with the following error: Boot error image radeon 0000:01:00.0 : failed VCE resume (-110). /sbin/init: error while loading shared libraries : libc.so.6 : cannot open shared ...
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Getting the message “[ 0.283078] Initramfs unpacking failed: Decoding failed” when booting ubuntu 20.04 then boots normal

so title basically says it. Before, I had problems installing the a200 intel wifi/bluetooth driver which I didn't manage to install properly (I had downloaded it but couldnt use it/ I didnt get it ...
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Load kernel first error (casper/vmlinuz not found)

I'm trying to boot Ubuntu via a USB live stick (dual boot with windows) , and the following error is being displayed error: file "/casper/vmlinuz not found" error: you need to load the kernel first....
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How can you control the number of kernel entries in GRUB Advanced Options?

I'm having an issue with the current kernel version, so I am booting with the previous one until the issued is resolved. Only the two most recent releases are listed in Advanced Options, which seems ...
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Remove unused kernel versions [duplicate]

How can I remove unused kernel versions un ubuntu 20.04? I don't use the newest avalable due to weird issues when using external screen and I would like to remove it. Thanks in advance.
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How to display kernel's PSI (Pressure Stall Information)?

I am running Ubuntu 16.04 and my Linux kernel version is 4.4.0. How can I enable the kernel's PSI? Or is there a tool that is similar?
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Every kernel update needs wifi drivers reinstalled (RTL8723be)

I am currently on ubuntu 20.04 and whenever I get kernel update I have to go through wifi driver installation again and again. I am tired of this and thinking of changing the OS(may try Pop!_OS) if I ...
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No WiFi Adaptor found, and Dummy output for sound when booting into different kernel

Background - I was originally trying to resolve the issue of Question - No audio in laptop speakers or headphones, but sound plays in screen (HDMI connection), I suspected kernel update and with the ...
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chassis fan running at full speed, fancontrol not working Ubuntu 20.04 Amd ASUS MB

I have tried to follow several methods to control my fans, nothing worked. I have a M4A88T-M motherboard with a Phenom AMD processor and NVIDIA Quadro600 PCIe card. I installed thermald, lmsensors, ...
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syslog filling with this error message, discord?

I noticed that my /var/log/syslog file is constantly being filled by this errors each second if I do have Discord app open. It continues until I quit Discord. Then stops. All I can understand from ...
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Slow USB Speed Likely due to uhci driver being loaded

It seems all my USB devices are being throttled back to USB1.1 (Full-Speed), and the best I can tell it's due to the kernel loading the uhci driver for the instead of ehci. I've tried every iteration ...
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How to unload kernel module permanently Ubuntu Server 20.04? [duplicate]

I have an Atomic PI and Ubuntu Server 20.04 installed on it. During shutdown it hangs with an error of "watchdog soft lockup" caused by DMA controller drivers called dw_dmac and dw_dmac_core Reason ...
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Reboot or shutdown hangs at “Reached target Reboot”. task kworker/2:2:214 blocked for more than 120 seconds

This suddenly started happening today on my Lenovo Thinkpad X1 Extreme Gen 2. The system configuration has not changed from when this issue did not occur. I'm using NVIDIA's proprietary driver 440....
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192 views

Wireguard fails to build module even tho kernel headers are installed?

Installed wireguard in Xubuntu (Ubuntu 18.04.4 LTS) via PPA. The kernel module failed. # modprobe wireguard modprobe: FATAL: Module wireguard not found in directory /lib/modules/5.3.0-51-generic I'...
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Why Ubuntu uses intermediate kernel versions? [closed]

Is there a reason why Ubuntu uses intermediate kernel version like 5.4.0-31-generic, and not something like 5.4.1? When I see the websites to download source codes like https://kernel.ubuntu.com/~...
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1answer
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Hang on shut down

I've just installed ubuntu 20.04 on a macbook pro 3,1. It has an SSD and BIOS boot partition rather than EFI (so I can load the NVIDIA drivers). I have no external USB devices attached. On shutdown, ...
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Virtual machine not running

I recently installed Ubuntu 20.04. I am trying to run Win 10 on Oracle Virtual Box 6.1.8(last version) but I get error "Kernel driver not installed (rc=-1908)" It suggests to run 'modprobe vboxdrv' ...
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How to unload a kernel module which is in use and has a recursive module dependency?

I habe a driver for my ELM 327 an it uses the pl2303 module which depends on the usbserial and this again depends on the pl2303 module. What I tried: sudo modprobe -r usbserial pl2303 sudo modprobe -...
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Autoremove wants to remove 127 (~5 Gb) packages

I know there are several other similar questions but I think my case is extreme. autoremove wants to get rid of all the packages/libraries listed below. That's more than 5 Gb of stuff! Is there ...
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audio device use ehci but I want xhci

How can I force a usbdevice to use xhci instead of ehci? I have a laptop where xhci grabs the card (works) and a PC where ehci grab the card (dont work) both computers run the same ubuntu 20.04 and ...
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Use unsigned kernel

I would like to enable hibernate whilst using Secure Boot on Ubuntu 20.04 which means self signing my own kernel images. When Ubuntu automatically updates the kernel, it uses the signed image from ...
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dpkg not functioning on kernel 5.6

System: Ubuntu 20.04; Kernel 5.6.0-050600-generic. I previously upgraded the kernel using mainline packages for Ubuntu 20.04 as this was known to fix an issue with my external display. Now whenever ...
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Grub not booting new kernel Ubuntu 16.04

I don't know what you need I just can say that grub is not booting the new kernel I updated grub and everything. My second problem is that I don't know what you need to see to help me so if you could ...
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no media present and repeted bios problem

I was having ubuntu 16.04 installed on my laptop. suddenly it started showing no media present and every time when I boot it, it returns on bios setting. I made a bootable Pendrive and I am able to ...
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Missing 802.1q module from Ubuntu 18.04

I have just installed a fresh copy of Ubuntu 18.04 LTS and I needed to add support for vlan tagging. So I did follow the usual wiki and then did, apt install vlan and then when trying to load / ...
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Cannot find stuff for my Kernel and Kernel Headers

I don't know what to say but I want to install Virtualbox and stuff but there is a problem with my kernel. Ubuntu says my kernel is 4.4.0-042stabl42.1 but no program can find something for that. When ...
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Ubuntu machine periodically hanging

I have a virtual machine running Ubuntu 16.04.6. Its sole purpose is to run Mayan EDMS (a Python document archival system) so I can have a mostly paperless household. It has been working fine for ...
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TP-LINK Archer T3U AC1300 Mini after Ubuntu update on 18.04.4 LTS

Original Question Three days ago my TP-LINK Archer T3U AC1300 Mini suddenly stopped working on after an automatic update of Ubuntu. Furthermore the system refused to completely shut down if the wifi ...
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102 views

ubuntu 20.04 hanging while working

have installed ubuntu 20.04 for about two(2) week now and they was no issue. but recently noticed the system keeps hanging for no reason while using. please is there any fix to this? This is very ...
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Audio Driver Missing

I have just installed Kubuntu 20.04 and oddly enough, while using the live usb's os, audio was working. However after installing the os Audio is not working. inxi info inxi -A Audio: Device-1: ...
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Issue? Timestamp of files wrong on Kernel 5.4.x

There may be a problem with Kernel 5.4.x in combination with external drives (in my case: microSD -card + card reader). Files which are showing a correct timestamp under Linux 4.x and MacOS (Windows ...
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Kern.log and Syslog Growing Uncontrollably (with details)

Similar to other questions about uncontrollable bloat in kern.log and syslog, but in my case I can’t figure out what in the kernel is causing it because I don’t recognize the process and my google ...

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