drivers – Specific versio of “activation of network connection failed” under Ubuntu 18.04


I have found many earlier questions here that at first glance, describe the same problem I am facing: the error message activation of network connection failed when trying to connect to any wi-fi network.

However, my case is rather particular in a few ways:

  • this problem appeared out of a sudden, after I rebooted my computer – that is, everything was working fine for more more than an year until minutes ago (also, I did not install any new software recently);
  • I can still see all wi-fi connections listed, but upon selection any, I get the error message (I did try forgetting/re-entering connections);
  • my Wi-Fi card (the one that has smoothly worked in the last year) is a PCI Express Wi-Fi adapter (so Ubuntu 18.04 – Activation of network connection failed does not help, and mine is not a duplicate of connection failed activation of network connection failed). More specifically, it is a FebSmart Wireless Dual Band N600 (2.4GHz 300Mbps or 5GHz 300Mbps). For reference, a lshw gives me the following wi-fi network (i.e. omitting Ethernet cards):
       *-network
            description: Wireless interface
            product: AR93xx Wireless Network Adapter
            vendor: Qualcomm Atheros
            physical id: 0
            bus info: pci@0000:02:00.0
            logical name: wlp2s0
            version: 01
            serial: e0:ca:94:c5:b0:57
            width: 64 bits
            clock: 33MHz
            capabilities: bus_master cap_list rom ethernet physical wireless
            configuration: broadcast=yes driver=ath9k driverversion=5.3.0-53-generic firmware=N/A latency=0 link=no

multicast=yes wireless=IEEE 802.11
resources: irq:16 memory:dfe00000-dfe1ffff memory:dfe20000-dfe2ffff

Other relevant outputs:

description: Computer
width: 64 bits
capabilities: smp vsyscall32   *-core
   description: Motherboard
   physical id: 0
 *-memory
      description: System memory
      physical id: 0
      size: 251GiB
 *-cpu:0
      product: Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz
      vendor: Intel Corp.
      physical id: 1
      bus info: cpu@0
      size: 1611MHz
      capacity: 3500MHz
      width: 64 bits
      capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts md_clear flush_l1d cpufreq

 *-cpu:1
      product: Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz
      vendor: Intel Corp.
      physical id: 2
      bus info: cpu@1
      size: 2130MHz
      capacity: 3500MHz
      width: 64 bits
      capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts md_clear flush_l1d cpufreq

And a iwconfiggives me:

wlp2s0 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=15 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
enp6s0 no wireless extensions.

enp7s0 no wireless extensions.

lo no wireless extensions.

enp9s0 no wireless extensions.

enp10s0 no wireless extensions.

What should I do to try to restore access through my PCI Express card, as I was just having minutes ago?