Comment 17 for bug 1931301

I have the exact same problem using 21.04. After resume it says something about the network cable being unplugged in the settings menu under network wired. I have found rebooting is the fastest way (only way that I know that works) to get back running. My work around is to not suspend. Configuration information:

lshw -C network outpu (with the network running)

*-network
       description: Ethernet interface
       product: Killer E2400 Gigabit Ethernet Controller
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: enp4s0
       version: 10
       serial: 00:4e:01:ac:76:26
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=alx driverversion=5.11.0-25-generic duplex=full ip=192.168.1.25 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:19 memory:ec500000-ec53ffff ioport:d000(size=128)