Wifi interface does often not show up after reboot

[Julian Bieringer-Hinterbuchinger]

Since i got a new laptop (ThinkPad L580) and installed Kubuntu 16.04.4 LTS with kernel 4.13.0-38-generic, i sometimes had to reboot so that the wifi interface showed up. Once it showed up it worked continuously for hours without an issue. When the update came to kernel 4.13.0-39-generic, it got worse. Now i have to reboot at least 5 times until my wifi interface shows up. Once it shows up it works continuously like on the previous kernel for the whole session but on next reboot the interface is missing again. It seems random whether the interface is loaded (or found) when booting. Don't know if this is an kernel issue but since it got lot worse right after the latest kernel update i assume so. Wired connections are working well without any issues.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-39.44~16.04.1-generic 4.13.16
Uname: Linux 4.13.0-39-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: amd64
CurrentDesktop: KDE
Date: Wed Apr 25 19:16:23 2018
InstallationDate: Installed on 2018-04-16 (9 days ago)
InstallationMedia: Kubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)

[Dave Goldsbrough (daveg-k)]

when your wifi fails rather than reboot you might find issuing this command in a terminal useful

sudo service network-manager restart

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Julian Bieringer-Hinterbuchinger (gc268dm)]

@Dave Goldsbrough

Thank you for your suggestion, but unfortunately i tried this approach already multiple times and it didn't help. I also thought it probably is an issue due to battery saving mode so I tried the following command without any positive result:

sudo sed -i 's/wifi.powersave = 3/wifi.powersave = 2/' /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf

[penalvch (penalvch)]

Julian Bieringer-Hinterbuchinger, could you please run the following command once from a terminal in order to attach additional debugging information:
apport-collect 1766940

[Julian Bieringer-Hinterbuchinger (gc268dm)]

@Christopher M. Penalver
Just executed the command "apport-collect 1766940".

[penalvch (penalvch)]

Julian Bieringer-Hinterbuchinger, unfortunately, it didn't appear to work.

As per below, what is supposed to happen is a web browser opens to a Launchpad URL where you log in, and then give permission to upload the requested data.

Did you do all of these steps?

apport-collect 1766940
The authorization page:
 (https://launchpad.net/+authorize-token?oauth_token=6lG2RjxHrf90VRgLFxQl&allow_permission=DESKTOP_INTEGRATION)
should be opening in your browser. Use your browser to authorize
this program to access Launchpad on your behalf.
Waiting to hear from Launchpad about your decision...

[Julian Bieringer-Hinterbuchinger (gc268dm)]

Yes, I followed all the above steps, then apport started running after I gave authorization in the browser and it crashed...

[Julian Bieringer-Hinterbuchinger (gc268dm)]

Crashed with following error:
dpkg-query: no packages found matching linux
Traceback (most recent call last):
  File "/usr/share/apport/apport-kde", line 530, in <module>
    sys.exit(UserInterface.run_argv())
  File "/usr/lib/python2.7/dist-packages/apport/ui.py", line 659, in run_argv
    return self.run_update_report()
  File "/usr/lib/python2.7/dist-packages/apport/ui.py", line 575, in run_update_report
    response = self.ui_present_report_details(allowed_to_report)
  File "/usr/share/apport/apport-kde", line 367, in ui_present_report_details
    desktop_info)
  File "/usr/share/apport/apport-kde", line 184, in __init__
    self.ui.ui_update_view(self)
  File "/usr/share/apport/apport-kde", line 358, in ui_update_view
    QTreeWidgetItem(keyitem, [str(line)])
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 21: ordinal not in range(128)
Segmentation fault (core dumped)

[penalvch (penalvch)]

Julian Bieringer-Hinterbuchinger:

1) Regarding apport-kde crashing, please file a new report about this via a terminal:
ubuntu-bug apport-kde

2) Regarding this report, as an alternative, could you please boot into a live environment of http://cdimage.ubuntu.com/daily-live/current/ and then run the apport-collect?

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]