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  1. Thread: Kernel 5.6

    by Doug S
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    Re: Kernel 5.6

    Seems that I can not run a KVM/QEMU type VM with the mainstream kernel running on the host. I get this:


    doug@s15:/etc/libvirt/qemu$ virsh start serv-ff
    error: Failed to start domain serv-ff...
  2. Thread: Kernel 5.6

    by Doug S
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    Re: Kernel 5.6

    O.K. I have been running it overnight on two computers. Done a kernel compile on one. O.K. so far.
    Clean kernel compile seems to take about 20% longer than it did for kernel 5.5.

    As of the last...
  3. [SOLVED] Re: How to pass packets between two network interfaces through manually written filte

    What are the sub-net masks? I am assuming those are two different sub-nets, perhaps with a 24 bit mask? What are the IP addresses of eth0 and eth1, the same or different?
    I think the "-o eth1"...
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    Re: Firewall rules not working as intended

    Your iptables rules listing seems incomplete, therefore we can not answer your question. Do this: "sudo iptables -v -x -n -L" and post it all, although I find ufw generated rule sets difficult to...
  5. [SOLVED] Re: A moment at which Ubuntu 20.04 switches from Gnome to Unity?

    Do you know how to check the status of a package's migration away from python 2.X dependencies?
    My particular example is the "kernel-package", which still wants to pull in a ton of python 2.x stuff:...
  6. [SOLVED] Re: A moment at which Ubuntu 20.04 switches from Gnome to Unity?

    I am having struggles with 20.04 and lingering python 2.X dependencies also.
  7. [server] Re: allow only 1 (not specific) IP at a time on a port

    @SeijiSensei : thanks for trying it and your additional information.

    I played around some more and had difficulties getting repeatable good test results. I think my suggested iptables rule should...
  8. [server] Re: allow only 1 (not specific) IP at a time on a port

    I think this iptables rule will also do what you want:


    sudo iptables -A INPUT -p tcp --dport 22 -s 0.0.0.0/0 -m connlimit --connlimit-above 1 -j DROP

    The rule will have to be placed properly...
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    [ubuntu] Re: macbook pro 13" mid 2012 getting hot

    Everything looks O.K. to me. The processor does seem a little warm for the load, but I don't think that is uncommon for laptops, not sure.
    I put some small CPU load on my test server (not a LapTop)...
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    [ubuntu] Re: macbook pro 13" mid 2012 getting hot

    Suggest this command as a monitoring tool:

    sudo turbostat --Summary --show Busy%,Bzy_MHz,PkgTmp,PkgWatt,GFXWatt,IRQ --interval 15
    where turbostat is in the linux-tools-common package.
    You can...
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    [ubuntu] Re: macbook pro 13" mid 2012 getting hot

    Which processor? Example:

    doug@s15:~/c$ grep "model name" /proc/cpuinfo
    model name : Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz
    model name : Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz
    ......
  12. Thread: Kernel 5.5

    by Doug S
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    Re: Kernel 5.5

    Among other kernel configuration changes, sometime during the kernel 5.4-rc series Ubuntu changed from "CONFIG_UCLAMP_TASK_GROUP is not set" to "CONFIG_UCLAMP_TASK_GROUP=y".
    The new cgroup v2...
  13. Thread: Kernel 5.5

    by Doug S
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    Re: Kernel 5.5

    Kernel 5.5-rc2 is available:


    doug@s18:~$ uname -a
    Linux s18 5.5.0-050500rc2-lowlatency #201912151930 SMP PREEMPT Mon Dec 16 00:45:08 UTC 2019 x86_64 x86_64 x86_64 GNU/LinuxI have only been...
  14. [all variants] Re: No CPU throttling after update to 19.10. Overheating instead.

    There was a similar case, involving the same kernel version, just the other day.
    The temporary solution was to use kernel 5.3.0-19 instead.
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    Re: Bridge Interface Not Passing Traffic

    UFW (which I do not use) is just a front end for iptables (which I do use). In addition to what Seiji already mentioned, Suggest to look at iptables contents for all of your scenarios as to what is...
  16. Re: Xen DomU won't boot via pygrub (lz4 decompression fails)

    I got hit by this some time ago with the mainline kernels, when Ubuntu switched to L4Z compression in the kernel configuration. I had to do this:


    scripts/config --disable KERNEL_LZ4...
  17. [server] Re: Compare copied files between server and NAS

    It sounds as though you want more than the standard output:

    doug@s15:~/backup_smythies.com_03$ rsync --delete --archive --verbose --dry-run --progress --exclude 'ext-20*\.bin*' --exclude...
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    Re: cpu frequency scaling

    Glad to hear that you got it working with kernel 5.3.0-19-generic. And thank you for reporting back, as so very many don't.

    I think there is a 5.3.0-24-generic in the pipeline. My suggestion at...
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    Re: cpu frequency scaling

    A difference is the kernel version. So it would be good to try kernel 5.3.0-18-generic on your installed system. I wonder if it is there, but it is just booting the newer one by default. Do you see...
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    Re: cpu frequency scaling

    could you post the contents of the /sys/devices/system/cpu/intel_pstate directory in each case? Example (wait more than 1 minute after boot):


    doug@goom-i5:~/temp-git-git/k5.4i5$ grep ....
  21. [ubuntu] Re: Suspend issue on kernel somewhere after 4.13 - how to debug?

    No, GIT will manage the process of bisection for you, using successive approximation.

    No, the suggestion is to use the mainline branch, which doesn't even know about Ubuntu.

    You really do not...
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    [ubuntu] Re: Intel 10th gen CPU support?

    You didn't mention if your 10th gen processor now works with Ubuntu or not? If not try the latest mainline kernel, 5.4.1
  23. [ubuntu] Re: Suspend issue on kernel somewhere after 4.13 - how to debug?

    O.K., actually i see that, on my test computer, the files in /var/log/pm* are all dated 2016, so guess not used anymore.

    You should see information in /var/log/kern.log and /var/log/suspend and...
  24. [ubuntu] Re: Problem installing apache webserver: “You don't have permission to access this re

    In earlier posts, I mentioned that access to non-standard directories also needed to specifically allow access via /etc/apache2/apache2.conf. That seems to be the case for my Ubuntu 16.04 test...
  25. for 20.04 Ubuntu serverguide changing URL and markdown language

    As of the 20.04 cycle, the Ubuntu serverguide is changing from DocBook to discourse markdown (markup?) language.
    A link will be added shortly to the main landing page at help.ubuntu.com, but...
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