I already reported the but using "ubuntu-bug linux" but could see nowhere to tell you what the problem actually was. In summary it is relatively new system, 18.04.4LTS 64bit and Maté 1.20.1 dual-booting with Windows 10 v.1909, built on a Gigabyte Aorus B450M mainboard, Ryzen 5 3400G with Radeon Vega Graphics × 8, Kingston A2000 M2 main drive and a supplementary 4TB data drive. A wired connexion to BT Hub 6 via BT Powerline is used and gives no trouble on any other system.
The system started with kernel 5.3.0-46 generic and was fine for a few months, booting in a few seconds. A couple of days ago the kernel upgraded itself to 5.3.0-51 generic and boot immediately became a minute or more.
Reverting to kernel 5.3.0-46 generic restores the fast boot time.
I can continue like this for a while but my main fear is that when the LTS update to 20.04 arrives the new kernel will contain the bug and reversion to 5.3.0-46 will no longer be possible.
I attach several files, tarred because you do not seem to provide the facility to attach more then one file. There are a copy of the current fstab, the output of hwinfo (taken with kernel v.51) and for each of the two kernels the data asked for on the Ubuntu website.
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ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: david 2069 F.... pulseaudio
/dev/snd/controlC0: david 2069 F.... pulseaudio
CurrentDesktop: MATE
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2020-01-05 (129 days ago)
InstallationMedia: Ubuntu-MATE 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
IwConfig:
eno1 no wireless extensions.
lo no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. B450 AORUS M
Package: linux (not installed)
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-51-generic root=UUID=ea9bdbd1-0964-411e-b2c3-45fad2b77eae ro quiet splash fastboot vt.handoff=1
ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
RelatedPackageVersions:
linux-restricted-modules-5.3.0-51-generic N/A
linux-backports-modules-5.3.0-51-generic N/A
linux-firmware 1.173.18
RfKill:
Tags: bionic
Uname: Linux 5.3.0-51-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 07/22/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F41
dmi.board.asset.tag: Default string
dmi.board.name: B450 AORUS M
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF41:bd07/22/2019:svnGigabyteTechnologyCo.,Ltd.:pnB450AORUSM:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnB450AORUSM:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: Default string
dmi.product.name: B450 AORUS M
dmi.product.sku: Default string
dmi.product.version: Default string
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
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 1878574
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.