At present the Ubuntu 20.04 linux-image-kvm kernel package don't include the tcp_bbr, sch_cake and sch_fq_codel kernel modules. The latter has been default on desktop for a number of release cycles; cake improves on this.
These queueing disciplines are instrumental to reducing queueing latency [bufferbloat.net]; the TCP congestion control algo elevates bandwidth on lossy paths (think clients on radio networks).
Enabling these kernel modules will ensure Ubuntu has an optimally competitive network stack in cloud/VM systems.
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ProblemType: Bug
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
CRDA: N/A
CasperMD5CheckResult: skip
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2018-05-18 (1013 days ago)
InstallationMedia: Ubuntu-Server 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1:
Lsusb-t: Error: command ['lsusb', '-t'] failed with exit code 1: /sys/bus/usb/devices: No such file or directory
Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
MachineType: QEMU Standard PC (Q35 + ICH9, 2009)
Package: linux (not installed)
PciMultimedia:
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-1033-kvm root=/dev/sda ro console=ttyS0,19200n8 net.ifnames=0 cgroup_disable=cpuset,cpu,cpuacct,blkio,memory nmi_watchdog=0
ProcVersionSignature: Ubuntu 5.4.0-1033.34-kvm 5.4.86
RelatedPackageVersions:
linux-restricted-modules-5.4.0-1033-kvm N/A
linux-backports-modules-5.4.0-1033-kvm N/A
linux-firmware 1.187.9
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
Tags: focal
Uname: Linux 5.4.0-1033-kvm x86_64
UpgradeStatus: Upgraded to focal on 2020-05-03 (298 days ago)
UserGroups: N/A
_MarkForUpload: True
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: rel-1.12.0-0-ga698c8995f-prebuilt.qemu.org
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-q35-3.1
dmi.modalias: dmi:bvnSeaBIOS:bvrrel-1.12.0-0-ga698c8995f-prebuilt.qemu.org:bd04/01/2014:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-3.1:cvnQEMU:ct1:cvrpc-q35-3.1:
dmi.product.name: Standard PC (Q35 + ICH9, 2009)
dmi.product.version: pc-q35-3.1
dmi.sys.vendor: QEMU
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1916869
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.