cannot access '/dev/video*' [closed]

edit

Hi there,

I am not sure if this is the right place to ask, but I would really appreciate your help.

I am having an issue with accessing to my web cam from my Lenovo Laptop (running Ubuntu 20.04).

yuxiang@yuxiang:/etc/modprobe.d$ ls /dev/video*
ls: cannot access '/dev/video*': No such file or directory


yuxiang@yuxiang:/etc/modprobe.d$ fswebcam -r 640x480 --no-banner image3.jpg
--- Opening /dev/video0...

yuxiang@yuxiang:~/catkin_ws$ roslaunch my_camera elp.launch
uvc_find_device: No such device (-4)
[ERROR] [1645657833.102061279, 1575.456000000]: Unable to open camera.
^C[libuvc_camera-2] killing on exit
[nodelet_manager-1] killing on exit
[ INFO] [1645657841.057052676, 1583.374000000]: Unloading nodelet /libuvc_camera from manager /nodelet_manager
shutting down processing monitor...



yuxiang@yuxiang:~/catkin_ws$ hwinfo --usb
02: USB 00.0: 0000 Unclassified device                          
  [Created at usb.122]
  Unique ID: Zj8l.Y_aYp4agq10
  Parent ID: pBe4.xYNhIwdOaa6
  SysFS ID: /devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0
  SysFS BusID: 2-4:1.0
  Hardware Class: unknown
  Model: "Intel(R) RealSense(TM) Depth Camera 435"
  Hotplug: USB
  Vendor: usb 0x8086 "Intel Corp."
  Device: usb 0x0b07 "Intel(R) RealSense(TM) Depth Camera 435"
  Revision: "50.b1"
  Serial ID: "933623025074"
  Module Alias: "usb:v8086p0B07d50B1dcEFdsc02dp01ic0Eisc01ip00in00"
  Driver Info #0:
    Driver Status: uvcvideo is not active
    Driver Activation Cmd: "modprobe uvcvideo"
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #14 (Hub)

03: USB 00.0: 0000 Unclassified device
  [Created at usb.122]
  Unique ID: POWV.ZGXmp31lfyE
  Parent ID: k4bc.2DFUsyrieMD
  SysFS ID: /devices/pci0000:00/0000:00:14.0/usb1/1-9/1-9:1.0
  SysFS BusID: 1-9:1.0
  Hardware Class: unknown
  Model: "Synaptics Unclassified device"
  Hotplug: USB
  Vendor: usb 0x06cb "Synaptics, Inc."
  Device: usb 0x00bd 
  Serial ID: "46be90c14e26"
  Speed: 12 Mbps
  Module Alias: "usb:v06CBp00BDd0000dcFFdsc10dpFFicFFisc00ip00in00"
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #10 (Hub)

04: USB 00.1: 0000 Unclassified device
  [Created at usb.122]
  Unique ID: QR8P.z1tM_FB91k0
  Parent ID: k4bc.2DFUsyrieMD
  SysFS ID: /devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.1
  SysFS BusID: 1-8:1.1
  Hardware Class: unknown
  Model: "Acer Integrated Camera"
  Hotplug: USB
  Vendor: usb 0x5986 "Acer, Inc"
  Device: usb 0x115f "Integrated Camera"
  Revision: "56.14"
  Serial ID: ""
  Speed: 480 Mbps
  Module Alias: "usb:v5986p115Fd5614dcEFdsc02dp01ic0Eisc02ip00in01"
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #10 (Hub)


 yuxiang@yuxiang:~$ /usr/sbin/lsmod | sort

ac97_bus               16384  1 snd_soc_core
acpi_pad              184320  0
acpi_thermal_rel       16384  1 int3400_thermal
aesni_intel           372736  4
arp_tables             24576  0
aufs                  262144  0
autofs4                45056  2
binfmt_misc            24576  1
bluetooth             552960  11 btrtl,btintel,btbcm,bnep,btusb
bnep                   24576  2
bpfilter               32768  0
bridge                176128  1 br_netfilter
br_netfilter           28672  0
btbcm                  16384  1 btusb
btintel                24576  1 btusb
btrtl                  24576  1 btusb
btusb                  57344  0
ccm                    20480  6
cfg80211              708608  3 iwlmvm,iwlwifi,mac80211
coretemp               20480  0
crc32_pclmul           16384  0
crct10dif_pclmul       16384  1
cryptd                 24576  2 crypto_simd,ghash_clmulni_intel
crypto_simd            16384  1 aesni_intel
drm                   491520  16 drm_kms_helper,i915
drm_kms_helper        184320  1 i915
e1000e                258048  0
ecc                    28672  1 ecdh_generic
ecdh_generic ...