Emanuele's questions

I am trying to remove completely Boost 1.71. I need to downgrade to a previous working library as from the version Boost 1.71 I am receiving 'boost::placeholders' has not been declared so I want to downgrade to Boost 1.66.

After typing on the terminal the ldconfig I am left with only one instance:

emanuele@emanuele-pc:~$ ldconfig -p | grep libboost
    libboost_thread.so.1.71.0 (libc6,x86-64) => /lib/x86_64-linux-gnu/libboost_thread.so.1.71.0

I tried to remove it using:

sudo rm -f /lib/x86_64-linux-gnu/libboost_*
sudo rm -rf /lib/x86_64-linux-gnu/libboost_*

But still the libboost_thread is there..

So I tried accessing via sudo synaptic and tried to remove it from there but received the following broken package warning:

Therefore thinking that there was something broken I did:

sudo apt-get update --fix-missing
udo apt-get install -f

but nothing...the libboost_thread is still there.

How do I make sure everything is fully removed?

I have been trying to install the Pencil Project on Ubuntu-18.04 to design user interfaces before implementing it. I have been having the following installation problem and I am not sure why. After downloading it I only

sudo apt install ./pencil_3.1.0.ga_amd64.deb && sudo apt install -f

Below the warning:

$ sudo dpkg -i pencil_3.1.0.ga_amd64.deb && sudo apt install -f 
(Reading database ... 257381 files and directories currently installed.) 
Preparing to unpack pencil_3.1.0.ga_amd64.deb ... 
Unpacking pencil (3.1.0.ga) over (3.1.0.ga) ... 
rm: cannot remove '/usr/share/applications/pencil.desktop': No such file or directory 
rm: cannot remove '/usr/share/applications/pencil.png': No such file or directory 
Setting up pencil (3.1.0.ga) ... 
mv: cannot stat 'pencil.desktop': No such file or directory 
mv: cannot stat 'pencil.png': No such file or directory 
chmod: cannot access '/usr/share/applications/pencil.*': No such file or directory 
Reading package lists... Done 
Building dependency tree        
Reading state information... Done 
0 upgraded, 0 newly installed, 0 to remove and 529 not upgraded.

And I am not sure why is not being installed. I consulted this source and also this and both sources said that there is a missing file in the folder indicated in the warning. There seems to be a missing icon or .png. But I downloaded the .deb from the official documentation. and simply

sudo apt install ./pencil_3.1.0.ga_amd64.deb && sudo apt install -f

I have a problem with my Ubuntu 19.04. As soon as I tried to boot the system it stops and the message I am getting is the following:

Failed to start MySQL Community Server

Attached is also a photo I took with my phone of the error isf that can be useful:

What I tried to solve the problem was enetring in recovery mode as is possible to see here:

I chose the Clean option as this post had my same problem. Unfortunately that didn't solve my problem and I am still stuck at the boot. I have found this post too which is sort of related (I don't have Apache) but in order to go ahead I would already have done the booting and accessing the terminal.

What can I do? Thank you very much for pointing in the right direction to solve this problem

I am building a project on visual studio code. I have successfully installed node.js version 12.13 and npm version 6.12 on my Ubuntu-19.04. Part of the code will also be execute on a raspberry-pi as external device. The project seems to run but at a certain point during the compilation and right after launching npm start it throws an error

Error: Could not locate the bindings file.Tried: and there is a small list. The print screen is attached below and I am not sure how to take care of that:

I am very close to make it work and have been trying to research the potential error but could not find any useful information. Please point to the right direction for solving this issue.

I just successfully installed npm 6.12, Node.js version 12.13 on my Ubuntu 19.04. I also successfully compiled a project using Visual Studio Code. It is my first time using VS and I have been trying to build this project with partial success and I don't understand why, despite the project compile successfully, it does not build.

Below the organization of the project tree:

This is the outcome of the terminal after a launch npm start where I successfully compile but not build:

Finally I can confirm that this is partially working because the localhost:4200 is actually working as is possible to see from the print screen below:

What I tried so far

I tried many different options from launching npm in any possible way from the terminal line embedded in VS, but also using Linux command line.

I went through the entire project and installed all missing libraries such as: scipy, matplotlib and pandas and numpy but still nothing on the localhost side.

In addition I have tried to start and stop several times npm but no luck.

The Problem

I should be able to interact with a graphical user interface but what I see is only the localhost:4200 page without any interaction and only red-ish colored.

What am I doing wrong or missing? Thanks for pointing in the right direction.

I have been trying to install Node.js and the related package npm on my Ubuntu 19.04. I have: v10.15.2 for Node.js and 5.8.0' fornpm`.

I know from this source that the default version of npm for Node 10.15.2 is 6.4.1. However when I try both to sudo apt update and sudo apt upgrade I am not able to upgrade npm to the requested version.

The error I am getting is below:

I have been doing a lot of research and I have tried to install in different ways:

1) I removed and reinstalled both Node.js and npm but nothing seems to change

2) after sudo apt update I have the following output:

3) I followed the following source, this one and also this additional source

4) After an additional time I also went on the official website and accessed to the download page and chose the option for "Installing Node.js via package manager" and went to the related options and accessed to the binary distributions and followed the command line advised command:

a) Using Ubuntu curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash - sudo apt-get install -y nodejs

I am running out of ideas and I am not sure on how to proceed from this point. anyone who could be of any guidance would be greatly appreciate to solve this problem.

I have recently installed Ubuntu-19.04. I saved the the most important data from Ubuntu-18.04 as an enormous .tar file as I had some broken files on my 18.04 and transferred everything to the new 19.04 so that I had the same exact layout/folders/data I had before. In this process of course some libraries/dependencies were lost and had to reinstall them.

On my computer I have CMake 3.13.4 from official documentation,Qt5 installed from official documentation,OpenCV 3.4.4 installed from here.

Almost all libraries and dependencies are restored, however I get the last three errors after launching CMake and Qt5:

/usr/bin/ld: ../../lib/liblibCam.so: undefined reference to TIFFOpen

/usr/bin/ld: ../../lib/liblibCam.so: undefined reference to TIFFClose

/usr/bin/ld: ../../lib/liblibCam.so: undefined reference to TIFFGetField collect2: error: ld returned 1 exit status

I am not sure if this compilation error is due to OpenCV. I installed fresh the following libraries: libtiff5 and libtiff5-dev but still the problem remains. Any idea why is not compiling successfully?