webcam – No device Found error with Cheese in Ubuntu 20.04.3 LTS

I have been struggling to start my webcam as i need to clear an interview with a video conferencing. I updated the OS from 18.04 to 20.04 but still I get the message No device found when I try to open cheese. Below is the output of the command lsusb

nik@nik:/$ lsusb
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Below are some commands executed

   nik@nik:/$ sudo modprobe uvcvideo
   nik@nik:/$ 

   niket@nik:/$ sudo modprobe vfe_v4l2
   modprobe: FATAL: Module vfe_v4l2 not found in directory 
    /lib/modules/5.4.0-81-generic
   niket@nik:/$ sudo modprobe gc2035
    modprobe: FATAL: Module gc2035 not found in directory / 
     lib/modules/5.4.0-81-generic


Can someone clarify me if webcam drivers are not there or how do I need to resolve this problem. I have looked into lot of online docs and applied them but still cannot resolve this issue.

food and drink – Can cheese in hand luggage be mistaken for plastic explosive?

You describe the cheese as needing to be opened from the top to avoid spilling it. This will be especially the case when it’s in your luggage and not being refrigerated. As such, the cheese will absolutely be counted as a “liquid or gel”, which is prohibited in hand luggage unless it’s in a container of under 100ml and in a one-litre resealable plastic bag.

The only way you will get your cheese through security is if they assume it’s solid based on the outside appearance. However, in the comments, you say that the cheese is well-known in the country you’re flying from, so it’s unlikely that they won’t recognize it.

Of course they know that, if it really is cheese, it’s completely safe. However, the job of the people doing the security checks is to implement the rules, and the rules say that liquids and gels can only be carried under certain conditions.

co.combinatorics – Mice, cheese and cycles: configuration change with minimum effort

****Two mice and three cheeses (represented by isosceles triangles) are connected by cotton wires (edges) in such a way that each mouse has a unique (one and only one) cycle, called ‘mouse cycle’, which includes that mouse only, and a set of cheeses.

Such Mice cycles have the following properties:

  1. Uniqueness: for each mouse, there is exactly one ‘mouse cycle’ made by that mouse only, and a set cheeses.

  2. The cheeses within each ‘mouse cycle’ are defined and cannot be changed.

  3. The relative position of mouse and cheeses within each ‘mouse cycle’ does not matter (the order of mice/cheeses may be changed).

  4. The relative orientation of mouse and cheeses within ‘mice cycles’ must be preserved. Mice/cheeses orientation is given by the isosceles triangle representation: the base of the triangle represents mouse’s tail/cheese’s base, whereas the opposite vertex represents mice’s head/cheese’s tip (see top of attached picture).

Using the following notation:
Mice b: light blue mouse B: dark blue mouse. Cheeses Y: yellow cheese, R: red cheese, O: orange cheese Angle bracket: mouse head/cheese tip.

With this notation, mouse cycles can be represented, for example, as:

  • Light blue mouse loop: b>, Y>
  • Dark blue mouse loop: B>, <O, Y>

Which indeed defines cheese content and relative orientation of mice/cheeses for the two mouse cycles (the order of cheeses/mice within each cycle does not matter as already stated).

See one possible visual representation of the above definition in Figure 1 in the attached picture.

Note that:

  • A cheese may be shared between mice, in which case the ‘mice cycles’ intersect.

  • Cheeses may not be part of any of ‘mice cycles’.

——In the visual representation, mice/cheeses connections can be re-arranged in any way as long as properties 1-4 above are preserved.

This means that the following transformations are valid ones:
a) The order of cheeses/mice may be changed. See example in Figure 2a.

b) The two cycles may be drawn such that they share edges. See example in Figure 2b.

c) One end of an isolated cheese (if present) may be connected to mice cycles’s edges. See example in Figure 2c.

—— Problem statement: Given an initial configuration ‘A’ for the two mice cycles, and a final configuration ‘B’ for the two mice cycles, what is the minimum possible number of ‘cuts’ and ‘links’ required to turn the initial configuration ‘A’ into the final one ‘B’, considering all possible equivalent arrangements of mice and cheeses connections obtained using the transformation properties a, b, c above?

See a specific example in Figure 3.

Is it possible to make general conclusions, i.e. conclusions independent from particular mice cycles configurations?

This problem, invented from scratch, has eluded me for a while, I have thought of it long but I’m still not sure how to approach ithow to start.

Any ideas? Has this problem been solved before? Is this problem somehow tractable?

The system won’t let me publish the pictures until I collect 10pts. Will post them ASAP.

I like cheese

Hello one & all at FP. I’m Al – alsarcastic but I’m not really sarcastic, well not that much.

You can probably see I joined FIVE YEARS AGO which was my last venture into the world of forums. Got a new job, got a new woman, got a new family. Life took over. Been meaning to get back into it for a while now and was just waiting to find a passion project I could get my teeth into.

So now I’m back and hoping to find some other folks willing to work with me for our mutual success. Mainly here…

I like cheese

Set the webcam camera for cheese using the command line

I have cheese (3.18.1) on Ubuntu 16.04 LTS. When I run it, however, there are no settings.

Theoretically, the camera can be set via the settings as described here:

Where are the settings / settings in Cheese Photo Booth?

Sometimes (like in my situation) the settings menu doesn't open. There is a workaround, but it is not ideal:

Gnome Cheese Settings / Prefs menu is missing

What about starting cheese from the command line? Does anyone have an example of device selection? I've tried the device number (from lsusb) and name, but all I get is a segmentation error, so I'm probably doing something wrong. For example:

Cheese – device "USB camera"

Any thoughts? Yes, there is guvcview, but cheese is installed by default in many systems, and I would imagine that it would be useful to know this type of camera specification.

Thank you very much.