After searching around I found the bug report #1849891 which suggested to remove backport-iwlwifi-dkms, which I just tried. After rebooting my wifi is working again.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1859857 Title: network-manager keeps asking for wifi password can't connect to any wifi Status in network-manager package in Ubuntu: Incomplete Bug description: This bug is the same as reported by #1859289, however I was not able to find this when using the ubuntu-bug tool. Since the last update my network-manager keeps asking me for wifi passworts, but then never connects. Password is definitely correct. Everything worked before the update. lsb_release -rd Description: Ubuntu 19.10 Release: 19.10 ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: network-manager 1.20.4-2ubuntu2 ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7 Uname: Linux 5.3.0-23-generic x86_64 ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 Date: Wed Jan 15 19:12:42 2020 IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2019-05-27 (233 days ago) InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Release amd64 (20190416) IpRoute: default via 192.168.1.1 dev enp0s25 proto dhcp metric 100 169.254.0.0/16 dev enp0s25 scope link metric 1000 192.168.1.0/24 dev enp0s25 proto kernel scope link src 192.168.1.23 metric 100 NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=false ProcEnviron: LANGUAGE= TERM=xterm-256color PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: network-manager UpgradeStatus: Upgraded to eoan on 2019-10-23 (83 days ago) nmcli-nm: RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN running 1.20.4 connected started full enabled enabled enabled enabled disabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1859857/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
