## Boot: Ubuntu does not start (new installation on a new computer)

I am working on a new configuration for my computer. My procedure for installing the new operating system on a 250 GB SSD. First, I installed W10 using 200 GB with EFI and secure boot option enabled in the BIOS. That works fine on my machine. After that, I installed Ubuntu on the same SSD (50 GB). The installation worked fine and also the GRUB2 works fine, since I see the two boot options, Ubuntu and Windows (I can still start W10). However, Ubuntu freezes immediately after selecting to start Ubuntu on the GRUB2 menu. After 1 – 2 s, my keyboard also freezes and I can't do anything.

Therefore, I deleted all partitions again and installed only Ubuntu. The installation procedure also works fine here, but I select Ubuntu after the Grub2 menu appears, it freezes again.

I am using a TRX40 Pro 10G motherboard with the latest BIOS update. The only thing I can analyze right now is the dmsg while booting the USB stick live. Here I get some data that I cannot interpret. They may not be needed here, but since I don't know what kind of information might be of interest to solve this problem, I will add that information here:

(    0.020007) smpboot: CPU0: AMD Ryzen Threadripper 3970X 32-Core Processor (family: 0x17, model: 0x31, stepping: 0x0)
(    0.020007) Performance Events: Fam17h core perfctr, AMD PMU driver.
(    0.020007) ... version:                0
(    0.020007) ... bit width:              48
(    0.020007) ... generic registers:      6
(    0.020007) ... value mask:             0000ffffffffffff
(    0.020007) ... max period:             00007fffffffffff
(    0.020007) ... fixed-purpose events:   0
(    0.020007) ... event mask:             000000000000003f
(    0.020007) rcu: Hierarchical SRCU implementation.
(    0.020007) random: crng done (trusting CPU's manufacturer)
(    0.020007) NMI watchdog: Enabled. Permanently consumes one hw-PMU counter.
(    0.020007) smp: Bringing up secondary CPUs ...
(    0.020007) x86: Booting SMP configuration:
(    0.020007) .... node  #0, CPUs:          #1
(    0.000000) WARNING: CPU: 1 PID: 0 at /build/linux-hwe-zHO4ZF/linux-hwe-5.0.0/arch/x86/kernel/cpu/mce/core.c:1490 mcheck_cpu_init+0x1a7/0x4c0
(    0.000000) CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.0.0-23-generic #24~18.04.1-Ubuntu
(    0.000000) Hardware name: Micro-Star International Co., Ltd. MS-7C60/TRX40 PRO 10G (MS-7C60), BIOS 1.20 01/07/2020
(    0.000000) RIP: 0010:mcheck_cpu_init+0x1a7/0x4c0
(    0.000000) Code: 48 03 3d 44 30 1c 4f 45 31 c0 31 c9 ba 00 00 10 00 48 c7 c6 90 ba e4 b0 e8 26 3b 0d 00 e9 97 fe ff ff 39 d0 0f 84 e9 fe ff ff <0f> 0b e9 e2 fe ff ff c7 05 d8 c7 7e 01 89 01 00 00 e9 ff fe ff ff
(    0.000000) RSP: 0000:ffffb37b40207e90 EFLAGS: 00010002
(    0.000000) RAX: 000000000000001c RBX: ffff99da3ce4f040 RCX: 0000000000000179
(    0.000000) RDX: 0000000000000018 RSI: 0000000000000001 RDI: 0000000000000179
(    0.000000) RBP: ffffb37b40207ea8 R08: ffffb37b40207dd0 R09: ffffb37b40207dd4
(    0.000000) R10: 0000000000000c80 R11: ffff99ca7b7bcda8 R12: 0000000000000118
(    0.000000) R13: ffffffffb28fa060 R14: 0000000000000002 R15: 0000000000000000
(    0.000000) FS:  0000000000000000(0000) GS:ffff99da3ce40000(0000) knlGS:0000000000000000
(    0.000000) CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
(    0.000000) CR2: 0000000000000000 CR3: 0000000ac360e000 CR4: 0000000000340ea0
(    0.000000) Call Trace:
(    0.000000)  ? detect_ht+0xf/0xd0
(    0.000000)  identify_cpu+0x3ea/0x580
(    0.000000)  identify_secondary_cpu+0x18/0x90
(    0.000000)  smp_store_cpu_info+0x49/0x60
(    0.000000)  start_secondary+0xa6/0x200
(    0.000000)  secondary_startup_64+0xa4/0xb0
(    0.000000) ---( end trace 3ca88aad3131db8a )---
(    0.020069)    #2   #3   #4


(    0.096076) ACPI: bus type PCI registered
(    0.096076) acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
(    0.096143) PCI: MMCONFIG for domain 0000 (bus 00-7f) at (mem 0xf0000000-0xf7ffffff) (base 0xf0000000)
(    0.096151) PCI: not using MMCONFIG
(    0.096151) PCI: Using configuration type 1 for base access
(    0.096151) PCI: Using configuration type 1 for extended access
(    0.097501) HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages
(    0.097501) HugeTLB registered 2.00 MiB page size, pre-allocated 0 pages
(    0.100008) ACPI: Added _OSI(Module Device)
(    0.100008) ACPI: Added _OSI(Processor Device)
(    0.100008) ACPI: Added _OSI(3.0 _SCP Extensions)
(    0.100008) ACPI: Added _OSI(Processor Aggregator Device)
(    0.117110) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117112) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117116) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117117) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117120) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117122) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117125) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117126) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117129) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117130) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117133) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117135) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117138) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117140) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117143) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117145) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117148) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117150) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117155) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117156) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117160) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117161) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117165) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117166) ACPI: Skipping parse of AML opcode: Device (0x5B82)
(    0.117170) ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20181213/psobject-221)
(    0.117171) ACPI: Skipping parse of AML opcode: Device (0x5B82)


Any clue is welcome.
I also add missing information (I guess many are missing here). Note that the system also freezes from recovery mode.

## networks – Ethernet is disconnected frequently and intermittently for a specific computer and a specific wall socket

I have a very specific problem that involves a specific desktop computer and a specific ethernet wall connector. I have already tried several different approaches to solve the problem, so read this post carefully as I describe them.

I have a desktop computer (specifications at the end of this post) connected to an ethernet wall connector in my condo. A couple of days ago, I noticed that the Internet was periodically cutting off for a short period of time. This was first noticed as a loss of video quality during transmission, but it also manifests itself as longer initial connection times when the computer is first turned on, periodic changes in the network status icon and disconnection of Online games

Of course, my first approach was to try changing the Ethernet cable for a different one. This did not correct the problem.

Then, I made sure that all of my unit's Wi-Fi connections, such as those on my mobile devices, function normally. There are no problems with the WiFi.

Then, I tried to connect my work laptop to the same connector that the desktop machine was using. I disabled WiFi connectivity to the laptop, to prevent it from changing, if it loses the signal. However, there were no problems with using the laptop on the same connector that the desktop machine was using.

I have a second wall socket in the area of ​​my home office, so I tried to take the mechanized desk there and plug it into that socket. Here it is where it gets interesting. The desktop machine had no problems executing that connector. In fact, I was able to play in the online game for a significant period of time, without interruption. Okay, the monitor in my home office area is not HD, so download bandwidth requirements may have been reduced. However, they would still have been important, and when it was connected to the first connector, it still had problems, even when there were no active user programs.

I tried to leave the laptop running on the first connector and the desktop running on the second connector, to see if the Windows Event Viewer detected disconnections, but none was received on any of the machines.

Finally, given the possibility that the problem was a power fluctuation, I tried to plug the laptop into the first connector and run the power from the same power bar as the desktop computer, with the mechanized desk and its peripherals (speakers , external sound amplifier, monitor) all running at the same time. Even so, the Event Viewer did not detect connectivity problems with the laptop using the first connector, nor did it change to battery power.

In summary, this problem ONLY occurs with the desktop computer and ONLY It happens with that specific jack.

This puts me in a kind of Catch-22. I can't take the desk to the store (it's still under warranty) and say something is wrong with the ethernet card because they will point out that it works fine on another connector. I can't call my ISP because they will point out that the WiFi is working, as well as the first connector with a laptop and the second connector with both computers. I can't make my building see it because they will point out that the connector works well with the laptop.

Any suggestions will be appreciated. The specifications follow.

Desktop

Aeon 1080 Gaming Tower, Intel Core i7-7700 3.6GHz Quad-Core, 8GB DDR4, 1 SSD 240GB and 1 HDD 1TB, RealTek PCIe GbE Family Controller, Windows 10 Home 64 Bit

Laptop

Lenovo ThinkPad, Intel Core i5-8250U 1.60GHz, 8 GB of RAM, 256GB SSD, RealTek PCIe GbE Family Controller, Windows 10 Pro 64 Bit

## computer vision: do you use the fundamental matrix for the triangulation process?

Given the projection matrices of two cameras ($$P$$,$$P & # 39;$$) and a couple of corresponding points $${x_i, x & # 39; _i }$$, it's easy to calculate the triangulation using $$x_i = PX, x & # 39; _i = P & # 39; X$$.

I understand that a similar algebraic process can be used to find $$X$$ using only the fundamental matrix $$F$$as it also contains $$(T) _xR$$, but I could not develop such an equation.
Does anyone know the derivation of such a process?

## Lexicographically minimal chain rotation – Computer Science Stack Exchange

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• Make statements based on opinion; Support them with references or personal experience.

Use MathJax to format equations. MathJax reference.

## how to fix my LWC plug i cable for my computer

If the LWC cable does not work when you connect it to the computer, but it works when you connect it to the wall

## Find a computer connected to the Sharepoint site

From a team in Microsoft Teams, I can select "Open in Sharepoint" to go to the Sharepoint site used for the team.

But if I had found the Sharepoint site first, how would I go / find the associated team and its channels?

## machine learning: can anyone think of applications of a 3-way point product in computer science (or k-way in general)

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angle = atan(S_y / S_x)