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Ubuntu Unity 7.6 - Fresh Install has no /dev/ttyUSB0/1

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I have a fresh install of Unity 7.6:

root@chris-Aura:/dev# uname -a
Linux chris-Aura 5.19.0-26-generic #27-Ubuntu SMP PREEMPT_DYNAMIC Wed Nov 23 20:44:15 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

The /dev/ttyUSBx device path does not currently exist or appear when my desired device is plugged in.

I have seen similar posts regarding the Brltty screen reader being the issue so I have removed this and restarted but this does not improve the situation.

sudo apt remove brltty 

I can see the device being recognised when I run dmesg:

[ 2785.269566] usb 1-1: new full-speed USB device number 14 using xhci_hcd
[ 2785.426355] usb 1-1: New USB device found, idVendor=2100, idProduct=9068, bcdDevice=10.00
[ 2785.426364] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2785.426368] usb 1-1: Product: CT68 Radio Cable
[ 2785.426371] usb 1-1: Manufacturer: RT Systems
[ 2785.426374] usb 1-1: SerialNumber: RT7DCUPB

Is is the CT68 Radio Cable that I'm hoping to use. I note in the above output that the information stops after the device's serial number - there is no 'attaching' to a USB port.

The lsusb command shows the CT68 device (second from bottom line):

root@chris-Aura:/dev# lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 8087:0a2b Intel Corp. Bluetooth wireless interface
Bus 001 Device 007: ID 046d:c31d Logitech, Inc. Media Keyboard K200
Bus 001 Device 006: ID 1bcf:0005 Sunplus Innovation Technology Inc. Optical Mouse
Bus 001 Device 005: ID 0b95:6802 ASIX Electronics Corp. AX68002 KVM Switch SoC
Bus 001 Device 003: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 014: ID 2100:9068 RT Systems CT68 Radio Cable
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
root@chris-Aura:/dev# 

Running the command - usb-devices does show the device (5th line) :

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 14 Spd=12  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=2100 ProdID=9068 Rev=10.00
S:  Manufacturer=RT Systems
S:  Product=CT68 Radio Cable
S:  SerialNumber=RT7DCUPB
C:  #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=90mA
I:  If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=81(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms

My output from lsmod is:

root@chris-Aura:/dev# lsmod
Module                  Size  Used by
cp210x                 40960  0
usbserial              57344  1 cp210x
ccm                    20480  3
rfcomm                 86016  4
snd_hda_codec_hdmi     81920  1
cmac                   16384  3
snd_hda_codec_realtek   163840  1
snd_hda_codec_generic   102400  1 snd_hda_codec_realtek
algif_hash             16384  1
ledtrig_audio          16384  1 snd_hda_codec_generic
algif_skcipher         16384  1
af_alg                 32768  6 algif_hash,algif_skcipher
bnep                   28672  2
snd_soc_avs           131072  0
snd_soc_skl           176128  0
snd_soc_hdac_hda       24576  1 snd_soc_skl
binfmt_misc            24576  1
snd_hda_ext_core       36864  3 snd_soc_avs,snd_soc_hdac_hda,snd_soc_skl
snd_soc_sst_ipc        20480  1 snd_soc_skl
snd_soc_sst_dsp        36864  1 snd_soc_skl
snd_soc_acpi_intel_match    69632  1 snd_soc_skl
snd_soc_acpi           16384  2 snd_soc_acpi_intel_match,snd_soc_skl
snd_soc_core          368640  3 snd_soc_avs,snd_soc_hdac_hda,snd_soc_skl
snd_compress           24576  1 snd_soc_core
ac97_bus               16384  1 snd_soc_core
snd_pcm_dmaengine      20480  1 snd_soc_core
intel_rapl_msr         20480  0
intel_rapl_common      40960  1 intel_rapl_msr
snd_hda_intel          53248  3
intel_tcc_cooling      16384  0
x86_pkg_temp_thermal    20480  0
snd_intel_dspcfg       36864  3 snd_soc_avs,snd_hda_intel,snd_soc_skl
intel_powerclamp       24576  0
snd_intel_sdw_acpi     20480  1 snd_intel_dspcfg
coretemp               24576  0
snd_hda_codec         172032  6 snd_hda_codec_generic,snd_soc_avs,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek,snd_soc_hdac_hda
snd_hda_core          118784  9 snd_hda_codec_generic,snd_soc_avs,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_hda_codec_realtek,snd_soc_hdac_hda,snd_soc_skl
snd_hwdep              20480  1 snd_hda_codec
kvm_intel             430080  0
snd_pcm               155648  9 snd_soc_avs,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_compress,snd_soc_core,snd_soc_skl,snd_hda_core,snd_pcm_dmaengine
i915                 3121152  88
joydev                 32768  0
input_leds             16384  0
snd_seq_midi           20480  0
kvm                  1138688  1 kvm_intel
iwlmvm                610304  0
nls_iso8859_1          16384  1
snd_seq_midi_event     16384  1 snd_seq_midi
drm_buddy              20480  1 i915
crct10dif_pclmul       16384  1
ttm                    98304  1 i915
snd_rawmidi            45056  1 snd_seq_midi
ghash_clmulni_intel    16384  0
mac80211             1327104  1 iwlmvm
mei_pxp                20480  0
drm_display_helper    184320  1 i915
aesni_intel           376832  6
snd_seq                77824  2 snd_seq_midi,snd_seq_midi_event
mei_hdcp               24576  0
btusb                  61440  0
cec                    81920  2 drm_display_helper,i915
btrtl                  24576  1 btusb
hid_generic            16384  0
libarc4                16384  1 mac80211
drm_kms_helper        200704  2 drm_display_helper,i915
btbcm                  24576  1 btusb
snd_seq_device         16384  3 snd_seq,snd_seq_midi,snd_rawmidi
crypto_simd            16384  1 aesni_intel
btintel                45056  1 btusb
cryptd                 24576  3 crypto_simd,ghash_clmulni_intel
btmtk                  16384  1 btusb
snd_timer              40960  2 snd_seq,snd_pcm
i2c_algo_bit           16384  1 i915
iwlwifi               503808  1 iwlmvm
rapl                   20480  0
fb_sys_fops            16384  1 drm_kms_helper
intel_cstate           20480  0
snd                   114688  19 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
intel_wmi_thunderbolt    20480  0
bluetooth             827392  34 btrtl,btmtk,btintel,btbcm,bnep,btusb,rfcomm
usbhid                 65536  0
wmi_bmof               16384  0
mei_me                 49152  2
syscopyarea            16384  1 drm_kms_helper
ee1004                 20480  0
cfg80211             1040384  3 iwlmvm,iwlwifi,mac80211
soundcore              16384  1 snd
hid                   159744  2 usbhid,hid_generic
sysfillrect            20480  1 drm_kms_helper
ecdh_generic           16384  2 bluetooth
sysimgblt              20480  1 drm_kms_helper
ecc                    40960  1 ecdh_generic
ir_rc6_decoder         20480  0
mei                   139264  5 mei_hdcp,mei_pxp,mei_me
intel_xhci_usb_role_switch    16384  0
intel_pch_thermal      20480  0
rc_rc6_mce             16384  0
ite_cir                28672  0
rc_core                65536  5 ite_cir,ir_rc6_decoder,rc_rc6_mce,cec
acpi_pad              184320  0
mac_hid                16384  0
msr                    16384  0
parport_pc             53248  0
ppdev                  24576  0
lp                     28672  0
parport                73728  3 parport_pc,lp,ppdev
drm                   585728  14 drm_kms_helper,drm_display_helper,drm_buddy,i915,ttm
pstore_blk             16384  0
ramoops                28672  0
reed_solomon           28672  1 ramoops
pstore_zone            32768  1 pstore_blk
efi_pstore             20480  0
ip_tables              32768  0
x_tables               57344  1 ip_tables
autofs4                45056  2
rtsx_pci_sdmmc         36864  0
crc32_pclmul           16384  0
e1000e                303104  0
rtsx_pci              106496  1 rtsx_pci_sdmmc
i2c_i801               36864  0
i2c_smbus              20480  1 i2c_i801
ahci                   49152  2
libahci                49152  1 ahci
xhci_pci               24576  0
xhci_pci_renesas       20480  1 xhci_pci
wmi                    32768  2 intel_wmi_thunderbolt,wmi_bmof
video                  61440  1 i915
root@chris-Aura:/dev#

I've seen other questions attempting to create the device path with the mknod command but I haven't heard of any success from doing this - I may try this if I become desperate enough.

Is there anything else I can investigate.

Many thanks in advance.

guiverc avatar
cn flag
Please be specific with details; you mention 22.04 but one detail makes me think you mean 22.10. Ubuntu Unity wasn't a *flavor* of Ubuntu before Ubuntu Unity 22.10. Please refer https://askubuntu.com/help/on-topic, Ubuntu and official *flavors* of Ubuntu (https://ubuntu.com/download/flavours) are on-topic on this site. The on-topic link provides alternate SE sites for non-Ubuntu OSes.
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