Xubuntu 18.10 wifi tl-wn821n shows SSIDs but can not connect. Unplug and plug works

[raullopezgn]

Hi, recently I have installed Xubuntu 18.10 (dual boot with Windows). At start the dongle tp-link tl-wn821n shows SSIDs and if I click on my wifi it can not connect to Internet. But if I unplug the dongle and I plug in it again it connects to my wifi :o

I try to install Xubuntu 18.04, Lubuntu 18.10, 18.04 and 16.10 and always the same problem. I will paste all the info that you may be will need to help me.
Important!! The code of the command dmesg it could have relevant info.

Thank you in advance for all your responses!!
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lsusb
** It doesn't appear any description of the dongle :(

Bus 002 Device 002: ID 8087:8001 Intel Corp. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8009 Intel Corp. 
Bus 003 Device 004: ID 2357:0107  
Bus 003 Device 003: ID 046d:c05a Optical Mouse
Bus 003 Device 002: ID 1c4f:0026  Micro Keyboard
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

iwconfig

lo           no wireless extensions.
enp3s0    no wireless extensions.

wlx503eaa3a0282  IEEE 802.11  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm   
          Retry short limit:7   RTS thr=2347 B   Fragment thr:off
          Encryption key:off    Power Management:off

inxi -Fnn
** If I unplug the dongle and I plug in it again, the "state: down" changes to "state: up";
When I discovered that before I unplugged the dongle I tried:
ifconfig wlx503eaa3a0282 up
service network-manager restart

But it didn't work :(

Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  driver: r8169 
  IF: enp3s0 state: down mac: 74:d4:35:a9:d2:4a 
  IF-ID-1: wlx503eaa3a0282 state: down mac: 50:3e:aa:3a:02:82

lshw -C network
**When I unplug the dongle and I plug in again, the "link=no" option change to "link=yes" and it also appears ip=xxx.xxx.x.xxx

*-network
       descripción: Interfaz inalámbrica
       id físico: 2
       información del bus: usb@3:9
       nombre lógico: wlx503eaa3a0282
       serie: 50:3e:aa:3a:02:82
       capacidades: ethernet physical wireless
       configuración: broadcast=yes driver=rtl8xxxu driverversion=4.18.0-13-generic firmware=N/A
       link=no multicast=yes wireless=IEEE 802.11

dmesg (part 1/2)
** This code appear before the dongle is unplugged. Below this code I paste the code after I unplug and plug the dongle again

[    0.698373] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[    0.698379] r8169 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control
[    0.698868] r8169 0000:03:00.0 eth0: RTL8168evl/8111evl, 74:d4:35:a9:d2:4a, XID 2c900800, IRQ 30
[    0.698870] r8169 0000:03:00.0 eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]

[    8.618510] usb 3-9: rtl8192eu_rx_iqk_path_b: Path B RX IQK failed!
[    8.642215] usb 3-9: rtl8192eu_rx_iqk_path_b: Path B RX IQK failed!
[    8.704814] usb 3-9: rtl8192eu_rx_iqk_path_b: Path B RX IQK failed!
[    8.728522] usb 3-9: rtl8192eu_rx_iqk_path_b: Path B RX IQK failed!
[    8.787041] usbcore: registered new interface driver rtl8xxxu

[    8.823662] rtl8xxxu 3-9:1.0 wlx503eaa3a0282: renamed from wlan0

[   16.701150] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready
[   16.873359] r8169 0000:03:00.0 enp3s0: link down
[   16.873431] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready
[   16.875521] IPv6: ADDRCONF(NETDEV_UP): wlx503eaa3a0282: link is not ready
[   16.881216] IPv6: ADDRCONF(NETDEV_UP): wlx503eaa3a0282: link is not ready
[   17.339945] IPv6: ADDRCONF(NETDEV_UP): wlx503eaa3a0282: link is not ready
[   19.667838] wlx503eaa3a0282: authenticate with b8:bc:1b:22:d1:24
[   19.671795] wlx503eaa3a0282: send auth to b8:bc:1b:22:d1:24 (try 1/3)
[   19.872046] wlx503eaa3a0282: send auth to b8:bc:1b:22:d1:24 (try 2/3)
[   20.076076] wlx503eaa3a0282: send auth to b8:bc:1b:22:d1:24 (try 3/3)
[   20.280103] wlx503eaa3a0282: authentication with b8:bc:1b:22:d1:24 timed out

[  282.005339] IPv6: ADDRCONF(NETDEV_UP): wlx503eaa3a0282: link is not ready
[  395.308499] r8169 0000:03:00.0: invalid large VPD tag 7f at offset 0
[  583.057931] wlx503eaa3a0282: authenticate with b8:bc:1b:22:d1:24
[  583.067051] wlx503eaa3a0282: send auth to b8:bc:1b:22:d1:24 (try 1/3)
[  583.268108] wlx503eaa3a0282: send auth to b8:bc:1b:22:d1:24 (try 2/3)
[  583.472144] wlx503eaa3a0282: send auth to b8:bc:1b:22:d1:24 (try 3/3)
[  583.676107] wlx503eaa3a0282: authentication with b8:bc:1b:22:d1:24 timed out

dmesg (part 2/2)
** Code after I have unplugged and I have plugged the dongle again

[ 3373.894299] usb 3-9: USB disconnect, device number 4
[ 3373.979145] usb 3-9: rtl8192eu_active_to_emu: Disabling MAC timed out
[ 3373.979147] usb 3-9: disconnecting
[ 3378.728117] usb 3-9: new high-speed USB device number 5 using xhci_hcd
[ 3378.876619] usb 3-9: New USB device found, idVendor=2357, idProduct=0107, bcdDevice= 2.00
[ 3378.876624] usb 3-9: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 3378.876627] usb 3-9: Product: 802.11n NIC 
[ 3378.876630] usb 3-9: Manufacturer: Realtek 
[ 3378.876633] usb 3-9: SerialNumber: 00e04c000001
[ 3378.878481] usb 3-9: This Realtek USB WiFi dongle (0x2357:0x0107) is untested!
[ 3378.936446] usb 3-9: Vendor: Realtek
[ 3378.936448] usb 3-9: Product: 802.11n NI
[ 3378.936450] usb 3-9: Serial: 
[ 3378.936453] usb 3-9: rtl8192eu_parse_efuse: dumping efuse (0x200 bytes):

[ 3378.936581] usb 3-9: RTL8192EU rev B (SMIC) 2T2R, TX queues 3, WiFi=1, BT=0, GPS=0, HI PA=0
[ 3378.936583] usb 3-9: RTL8192EU MAC: 50:3e:aa:3a:02:82
[ 3378.936585] usb 3-9: rtl8xxxu: Loading firmware rtlwifi/rtl8192eu_nic.bin
[ 3378.936684] usb 3-9: Firmware revision 19.0 (signature 0x92e1)
[ 3379.743896] usb 3-9: rtl8192eu_rx_iqk_path_b: Path B RX IQK failed!
[ 3379.856691] rtl8xxxu 3-9:1.0 wlx503eaa3a0282: renamed from wlan0
[ 3379.879639] IPv6: ADDRCONF(NETDEV_UP): wlx503eaa3a0282: link is not ready
[ 3379.885182] IPv6: ADDRCONF(NETDEV_UP): wlx503eaa3a0282: link is not ready
[ 3379.927114] IPv6: ADDRCONF(NETDEV_UP): wlx503eaa3a0282: link is not ready
[ 3380.993015] wlx503eaa3a0282: authenticate with b8:bc:1b:22:d1:24
[ 3380.996876] wlx503eaa3a0282: send auth to b8:bc:1b:22:d1:24 (try 1/3)
[ 3380.998294] wlx503eaa3a0282: authenticated
[ 3381.004019] wlx503eaa3a0282: associate with b8:bc:1b:22:d1:24 (try 1/3)
[ 3381.007078] wlx503eaa3a0282: RX AssocResp from b8:bc:1b:22:d1:24 (capab=0x411 status=0 aid=3)
[ 3381.007620] usb 3-9: rtl8xxxu_bss_info_changed: HT supported
[ 3381.008157] wlx503eaa3a0282: associated
[ 3381.051685] IPv6: ADDRCONF(NETDEV_CHANGE): wlx503eaa3a0282: link becomes ready

lsmod

rtl8xxxu              122880  0
mac80211              794624  1 rtl8xxxu
r8169                  86016  0
arc4                   16384  2
snd_soc_rt5640        126976  0
snd_hda_codec_realtek   106496  1
snd_soc_rl6231         16384  1 snd_soc_rt5640
snd_soc_core          229376  1 snd_soc_rt5640
snd_hda_codec_generic    73728  1 snd_hda_codec_realtek
snd_hda_codec_hdmi     49152  1
snd_compress           20480  1 snd_soc_core
ac97_bus               16384  1 snd_soc_core
intel_rapl             20480  0
x86_pkg_temp_thermal    16384  0
intel_powerclamp       16384  0
coretemp               16384  0
snd_hda_intel          40960  4
radeon               1462272  11
snd_hda_codec         126976  4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
kvm_intel             208896  0
ttm                   106496  1 radeon
snd_hda_core           81920  5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
joydev                 20480  0
snd_pcm_dmaengine      16384  1 snd_soc_core
snd_seq_midi           16384  0
kvm                   622592  1 kvm_intel
input_leds             16384  0
cfg80211              663552  1 mac80211
snd_seq_midi_event     16384  1 snd_seq_midi
drm_kms_helper        172032  1 radeon
snd_hwdep              20480  1 snd_hda_codec
snd_rawmidi            32768  1 snd_seq_midi
snd_pcm                98304  7 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_soc_rt5640,snd_soc_core,snd_hda_core,snd_pcm_dmaengine
mei_me                 40960  0
snd_seq                65536  2 snd_seq_midi,snd_seq_midi_event
snd_seq_device         16384  3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer              32768  2 snd_seq,snd_pcm
drm                   458752  13 drm_kms_helper,radeon,ttm
i2c_algo_bit           16384  1 radeon
fb_sys_fops            16384  1 drm_kms_helper
syscopyarea            16384  1 drm_kms_helper
sysfillrect            16384  1 drm_kms_helper
sysimgblt              16384  1 drm_kms_helper
irqbypass              16384  1 kvm
crct10dif_pclmul       16384  0
snd                    81920  21 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_compress,snd_soc_core,snd_pcm,snd_rawmidi
mei                    98304  1 mei_me
crc32_pclmul           16384  0
soundcore              16384  1 snd
video                  45056  0
ghash_clmulni_intel    16384  0
pcbc                   16384  0
acpi_pad              180224  0
mac_hid                16384  0
aesni_intel           200704  0
aes_x86_64             20480  1 aesni_intel
crypto_simd            16384  1 aesni_intel
cryptd                 24576  3 crypto_simd,ghash_clmulni_intel,aesni_intel
glue_helper            16384  1 aesni_intel
intel_cstate           20480  0
intel_rapl_perf        16384  0
sch_fq_codel           20480  6
parport_pc             36864  1
ppdev                  20480  0
lp                     20480  0
parport                49152  3 parport_pc,lp,ppdev
ip_tables              24576  0
x_tables               40960  1 ip_tables
autofs4                40960  2
hid_generic            16384  0
usbhid                 49152  0
hid                   126976  2 usbhid,hid_generic
gpio_ich               16384  0
i2c_i801               28672  0
ahci                   40960  3
libahci                32768  1 ahci
lpc_ich                24576  0
mii                    16384  1 r8169

ifconfig

wlx503eaa3a0282: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 50:3e:aa:3a:02:82  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

--------END---------

[chili555]

After a boot try if this gets it working without a re-plug:

sudo modprobe -r rtl8xxxu
sudo modprobe rtl8xxxu

Thanks.

-------------------
Possible reference: https://forums.linuxmint.com/viewtopic.php?t=274947

my guess is the driver isn't waiting for the hardware to be fully initialized and thus it doesn't set the device up correctly the first time it gets loaded.

[raullopezgn]

@chili555 it worked!! Thank you very much, I have spent so many hours looking for other post.... :(

After I have tested your suggestion (x2-3 times) I have read the post you have mentioned. In order to apply the workaround permanently. The solution is:

printf '#!/bin/sh\nmodprobe -r rtl8xxxu\nmodprobe rtl8xxxu\n' | sudo tee /etc/rc.local
sudo chmod +x /etc/rc.local

PS: This overwrites an existing /etc/rc.local file - don't use should you have created one yourself already, just append the workaround to the existing file then.