I have the same problem. I see packets being received by Ubuntu through the WiFi iface, but they don't seem to be delivered.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1870359 Title: My machine as Wi-Fi Hotspot broken after upgrade to 20.04 Status in network-manager package in Ubuntu: Confirmed Bug description: I have a machine with a wired network connection and a wifi card. I've been using the machine as a wireless router and server in my house. I've attached a screenshot of the Wi-Fi network settings. It looks as expected. Upon updating to 20.04, none of my machines can use the connection. The linux machine will not connect. The windows machine will connect but will not have internet. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: network-manager 1.22.10-1ubuntu1 ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27 Uname: Linux 5.4.0-21-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.11-0ubuntu22 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Thu Apr 2 15:47:02 2020 IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2015-09-30 (1645 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) IpRoute: default via 192.168.0.1 dev eth0 proto static metric 100 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.100 metric 100 SourcePackage: network-manager UpgradeStatus: Upgraded to focal on 2020-04-02 (0 days ago) WifiSyslog: mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2018-01-13T14:45:42.987041 nmcli-nm: RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN running 1.22.10 connected started full enabled enabled enabled enabled enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1870359/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp