José Marín's questions

I installed Maxima via Terminal (sudo-apt install maxima) also its documentation (sudo apt-install maxima-doc) and when I open Maxima and try to run the test command:

run_testsuite(display_all=true);

it does nothing because an error break :

At the end in the error summary shows every tests is failed because an error break and

0 tests failed out of 0 total tests. real time : 0.449 secs

run-gbc time : 0.140 secs

child run time : 0.000 secs

gbc time : 0.000 secs

(%o1) done

how can I fix this? I'm using Ubuntu 20.04.2 LTS

I'm interested in create a math fashion video, and realized I need to type several math equations to display. If is a basic stuff this could be done with the title options in kdenlive and unicode characters. But when the equations are a little bit complex like in this post (the overbrace bracket), the thing starts to be very difficult and hard to mantain. So I want to know if there is a way to use LaTeX in kdenlive. Something of how the MathStackExchange forum posts work. Just using the symbol $ and in bewteen the LaTeX syntax and it generates the math equations.

Alternatively I tried to export from LaTeX the svg of the equations, but when passing to kdenlive it looks cutre.

I'm not pretty sure what is the problem. But I already installed the Compiz Manager Settings (I want to be able to do zoom for creating tutorials) on my Ubuntu 18.04 (Bionic Beaver) but no matter if I check the box for enabling the effect and configure the hotkeys no one effect is working.

EDIT 1. I follow the answer of KYAA7 but I don't know how to use Dconf in order to Compiz to work. I installed dConf editor as in the link provided by him. But it looks a bit different from the shown there. Here a screenshot:

As you can see there is no Compiz folder or something like that, also is not in the folder apps. What I suppose to do with this software for using Compiz and their zoom feature?

I was looking for an origami simulation program (can simulate a piece of paper and fold) and I found the following: https://www.youtube.com/watch?v=1TAOKIRV2d4 It looks very nice so I tried to use it... but I couldn't. and I don't why. I get the following message error:

ImportError: No module named visual

And I have python and vpython. Also I tried to change the line of code:

import visual * for

import vpython *

of the .py script but it wasn't effective.

Can you help me to run this program in ubuntu please? or do you know another good origami simulation program I can use in Ubuntu?

EDIT 1. According to the comment by @Dimitrios Zacharatos I typed

pip install vpython and got the following:

Command 'pip' not found, but can be installed with:
sudo apt install python-pip

So I did it and again typed:

pip install vpython

This time at the end of the process I got the following warning:

jupyter-server-proxy requires Python '>=3.5' but the running Python is 2.7.17

Recently I installed the chess game software Knights for ubuntu. I'm trying to play online using a server (a feature according to the website: https://kde.org/applications/games/org.kde.knights) But I got the following issue:

How can I able that menu?

Edit 1. I run the command: hostnamectl and got this:

Static hostname: marin-Aspire-E5-521
     Icon name: computer-laptop
       Chassis: laptop
    Machine ID: 403b41e1f87f499cb8b39aea045edc36
       Boot ID: 84fabc4a665c48c4bd4f6ae1b525e488 
    Operating System: Ubuntu 18.04.3 LTS
        Kernel: Linux 4.15.0-74-generic
    Architecture: x86-64

The version of Knight is:

I installed it using the Ubuntu Software aplication. (I don't know how to use snap or deb packages)

Edit 2. Sorry for the snipped image. Here the complete window:

Edit 3.

Those are my options for computer engine, there is not a chess server.

I cannot enable the chess server option.

Edit 4.

I already have the XBoard and UCI protocols installed.

Edit 5.

I already have Ubuntu 18.04.3 LTS. It is in a disk partitioned with Windows 10 ( With windows boot manager and UEFI). I also have a ext4 partition just for files, obviously only avialble in ubuntu.

Recently I have been experienced problems with Ubuntu so I decide to reinstall it. I don't want to erase the other partitions.

Trough the Installation I have two main options (clearly I do not want to erase the disk) the first one and the last one like the picture below:

When I choose the first one it show me the next dialog:

And when I choose the last one it show me this:

I am not an expert so I want to avoid the last option. My question it is safe if I proceed with the first one? Or it will erased the other partitions.

EDIT 1:

The partition with the /root is in partition 7.

Bluetooth in Ubuntu on a dual boot Acer Aspire E5-521 laptop fails with this message:

I also have Windows 10 at the same disk but with another partition and there the Bluetooth is working properly.

How can I get the Bluetooth work in Ubuntu?

EDIT 1

I try to type: sudo /etc/init.d/bluetooth start in the Terminal and I got: sudo: /etc/init.d/bluetooth: command not found

EDIT 2

Typing the command lspci -knn | grep Net -A3; lsusb in the terminal I got the next output:

`02:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM43142 802.11b/g/n [14e4:4365] (rev 01)
    Subsystem: Lite-On Communications Inc BCM43142 802.11b/g/n [11ad:6645]
    Kernel driver in use: wl
    Kernel modules: wl
Bus 002 Device 003: ID 06cb:2970 Synaptics, Inc. touchpad
Bus 002 Device 002: ID 0438:7900 Advanced Micro Devices, Inc. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 1bcf:2c6e Sunplus Innovation Technology Inc. 
Bus 001 Device 003: ID 04ca:2009 Lite-On Technology Corp. 
Bus 001 Device 002: ID 0438:7900 Advanced Micro Devices, Inc. 
Bus 001 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 `

EDIT 3

I'm following the solution of: Bluetooth Broadcom 43142 isn't working

In step 7 checking if the file name is correct with the command: dmesg | grep -i blue I got the next message:

[ 23.906556] Bluetooth: Core ver 2.22 [ 23.906821] Bluetooth: HCI device and connection manager initialized [ 23.906827] Bluetooth: HCI socket layer initialized [ 23.906831] Bluetooth: L2CAP socket layer initialized [ 23.906854] Bluetooth: SCO socket layer initialized [ 24.034310] Bluetooth: hci0: BCM: chip id 70 [ 24.035305] Bluetooth: hci0: BCM: features 0x06 [ 24.051295] Bluetooth: hci0: BCM43142A [ 24.051301] Bluetooth: hci0: BCM (001.001.011) build 0000 [ 24.074628] bluetooth hci0: Direct firmware load for brcm/BCM.hcd failed with error -2 [ 24.074633] Bluetooth: hci0: BCM: Patch brcm/BCM.hcd not found [ 26.321504] Bluetooth: hci0: command 0x1003 tx timeout [ 26.322983] Bluetooth: hci0: unexpected event for opcode 0x1003

EDIT 4

It seems that the correct name for the .hcd file is BCM.hcd for my kernel 4.15.0-64-generic. Then after I shut down and and shut on my computer I get the following output for dmesg | grep -i blue command:

[ 23.041730] Bluetooth: Core ver 2.22 [ 23.041765] Bluetooth: HCI device and connection manager initialized [ 23.041772] Bluetooth: HCI socket layer initialized [ 23.041776] Bluetooth: L2CAP socket layer initialized [ 23.041798] Bluetooth: SCO socket layer initialized [ 23.170312] Bluetooth: hci0: BCM: chip id 70 [ 23.171306] Bluetooth: hci0: BCM: features 0x06 [ 23.187310] Bluetooth: hci0: marin-Aspire-E5-521 [ 23.187318] Bluetooth: hci0: BCM (001.001.011) build 0270 [ 23.945369] Bluetooth: hci0: BCM (001.001.011) build 0270 [ 23.962274] Bluetooth: hci0: Bluetooth USB module

That solves the firmware problem of the driver for the Bluetooth. Thanks @Pilot6

But still I got the same error message at the beginning of this question. So I decide to try to use my Bluetooth trough the terminal. At the very first I found the following command:

sudo service bluetooth start

And that almost solve my problem; now I can use my Bluetooth properly in Ubuntu. But still remains a little issue: I need to run the above command every time I restart the computer in order to get working the Bluetooth.

EDIT 5 [AND THE SOLUTION]

I run the command: sudo systemctl enable bluetooth That prevents that I have to run: sudo service bluetooth start every time I restart. But now the Bluetooth is always turned on! ( as expected I think) So I had kind of the opposite situation where I have to turn off the Bluetooth every time the Ubuntu starts to save battery energy when I do not need it. Thus I went to Startup Applications Preferences and uncheck the Bluetooth:

And that's it! That completely and finally fix my Bluetooth in Ubuntu.

I have a HDD with a ext4 partition reserved just for files, and when I try to put some file in the trash, It will show me the error:

I already check for this, and try

But when I did this. It will appear the following message error while I try to mount the partition:

I have other disk partition that contain windows and there I don't get the problem neither in my ubuntu partition. Can you help me please?

The problem is within a program that their documentation is in a html file. Let's say Tex maker or wxMaxima. When I click the tag "Help" it show me the documentation through the browser, not in a small windows has it used to show. I have Microsoft Windows in the same hard disk (in another partition) and I do not experience the problem there.

I have ubuntu 18.04 (Bionic Beaver)