Ubuntu 18 OpenGL compilation issues

1) 

In file included from main.cpp:8:0:
gluvi.h:10:10: fatal error: GL/glut.h: No such file or directory
#include <GL/glut.h> // ...when everyone else puts it here?
         ^~~~~~~~~~~

$ sudo apt-get install freeglut3-dev

2)

util.h: In function ‘double randhashd(unsigned int)’:
util.h:259:33: error: ‘UINT_MAX’ was not declared in this scope
{ return randhash(seed)/(double)UINT_MAX; }

#include <climits>

3)


array1.h: In constructor ‘Array1<T>::Array1(long unsigned int, const T*, long unsigned int)’:
array1.h:124:12: error: ‘memcpy’ is not a member of ‘std’
      std::memcpy(data, data_, n*sizeof(T));

#include <cstring>

4) Does not find/recognize libGL

fincahuanaco@pisces:~/DRIVE/Research23/viscosity$ g++ testgl.cpp -lglut -lGLU -L/usr/lib -lGL
/usr/bin/ld: cannot find -lGL
collect2: error: ld returned 1 exit status

#Check symbolic link

$ file /usr/lib/x86_64-linux-gnu/libGL.so 

/usr/lib/x86_64-linux-gnu/libGL.so: broken symbolic link to libGL.so.1.0.0 

 

$ file /usr/lib/x86_64-linux-gnu/libGL.so.1.7.0 #this is right file

/usr/lib/x86_64-linux-gnu/libGL.so.1.7.0: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, stripped

#Update libGL link, first go to directory and update

$ cd /usr/lib/x86_64-linux-gnu
$ sudo ln -s libGL.so.1.7.0 libGL.so

#back to source directory and try again

fincahuanaco@pisces:~/DRIVE/Research23/viscosity$ g++ testgl.cpp -lglut -lGLU -lGL            
fincahuanaco@pisces:~/DRIVE/Research23/viscosity$ ./a.out

References:

[1] First OpenGL code http://www.codebind.com/linux-tutorials/install-opengl-ubuntu-linux/

Jetson Wifi issues

#Alternative to wpa_supplicant

Creating connection(important don't remove --):

$ nmcli connection add type wifi con-name "myconname" ifname wlan0 ssid "eduroam" -- wifi-sec.key-mgmt wpa-eap 802-1x.eap ttls
 802-1x.phase2-auth mschapv2 802-1x.identity "USERNAME" 

$ sudo --ask nmcli c up myconname 

 

 

$ ls /etc/NetworkManager/system-connections  #show connections

$ cat /etc/NetworkManager/system-connections/myconname #show file connection 

$ nmcli con show myconname  #show connection detailed

Error 1:

password for '802-1x.identity' not given in 'passwd-file' 

Solution 1:

$ vi mypassfile  #add next line with pass value

802-11-wireless-security.psk:mypassvalue

$ nmcli con up <myconname> passwd-file <mypassfile>



References:

[1] Single connection https://www.linuxfordevices.com/tutorials/ubuntu/connect-wifi-terminal-command-line

[2] https://vessokolev.blogspot.com/2018/08/using-nmcli-to-create-8021x-eap-ttls.html

 

 

 

Python - Creating virtual environments

Install pip if it doesn't exist

$curl -O https://bootstrap.pypa.io/get-pip.py

$python3 get-pip.py --user

$python3 -m pip list

$python3 -m pip install tensorflow --no-cache-dir  #for space issue
 

Error during execution of: python3.8 -m venv myenv

Error: Command '['/path/to/desired/env/bin/python3.8', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1.

Solution: Create a virtual environment using a especific python version

$virtualenv --python=$(which python3.7) envtf4p37

 

Proxy list and tools

 

 

Tools:

[1] https://hidemy.name/en/proxy-checker

[2] Listing proxies by country https://www.proxynova.com/proxy-server-list/country-us

Jetson Nano and Tensorflow 2.4 in Python3.6

 

References:

[1] https://qengineering.eu/install-tensorflow-2.4.0-on-jetson-nano.html

[2] Lite https://qengineering.eu/install-tensorflow-2-lite-on-jetson-nano.html

[3] Install bazel https://github.com/jkjung-avt/jetson_nano/blob/master/install_bazel-3.1.0.sh

Linux verify disk activities

 

 

$ sudo apt-get install iotop

$ sudo iotop -a
$ sudo iotop -oPa -d 2  #more specific
 

$ iostat  #activity by sda, sdb, etc.
 

jbd2 is a kernel thread that updates the filesystem journal.

 

References:

[1] Reduce firefox disk access https://gist.github.com/gagarine/5cf8f861abe0dd035b7af19e4f691cd8

[2] Monitoring disk activity(htop) https://askubuntu.com/questions/276669/how-to-monitor-disk-activity

Get create/birth date from files

$ stat wakeup.txt  #get the inode

$ df -h wakeup.txt #get device name sdxy

$ sudo debugfs -R 'stat <586205>' /dev/sda1

Output:

Inode: 586205   Type: regular    Mode:  0664   Flags: 0x80000
Generation: 1277687204    Version: 0x00000000:00000001
User:  1000   Group:  1000   Size: 31
File ACL: 0    Directory ACL: 0
Links: 1   Blockcount: 8
Fragment:  Address: 0    Number: 0    Size: 0
ctime: 0x615eed87:dba39c9c  -- Thu Oct  7 09:52:23 2021
atime: 0x64231159:334e6b48  -- Tue Mar 28 13:10:01 2023
mtime: 0x615eed87:dba39c9c  -- Thu Oct  7 09:52:23 2021
crtime: 0x615eed87:dba39c9c -- Thu Oct  7 09:52:23 2021
Size of extra inode fields: 32

 

References:

[1] https://www.linuxshelltips.com/find-file-creation-date/

[2] https://www.baeldung.com/linux/get-file-creation-date

 

Jetson Nano installation

 

Installing cuda11 in Jetson Nano [1]. All instructins works, but doesn't run on it. Better is cuda10.

 

[1] https://jfrog.com/connect/post/installing-cuda-on-nvidia-jetson-nano/

 

 

Errors:

The following packages have unmet dependencies

...
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

Fix:

sudo apt-get -o dpkg::Options::="--force-overwrite" install --fix-broken

 

Python and OpenCV issues

Error:

   import cv2, numpy as np,time
 File "/home/fincahuanaco/.local/lib/python3.7/site-packages/cv2/__init__.py", line 3, in <module>
   from .cv2 import *
ImportError: numpy.core.multiarray failed to import

 

Solution:

$ python3 -m pip install opencv-python==4.0.0.21

$ python3 -m pip list  
 

opencv-python          4.0.0.21

numpy                  1.15.0

 

Other combinations

opencv_python==4.4.0.46 and numpy==1.19.3 works.

 

AWS Common commands

 

Without ifconfig command

public IP

$ curl ifconfig.me

private IP

$ ip addr 

References:

[1] https://opensource.com/article/18/5/how-find-ip-address-linux

ffmpeg: Extract mp3 from video

 

 ffmpeg -i mad-principio_peter.mp4 -vn -y out1.mp3 #9M

 

ffmpeg -i mad-principio_peter.mp4 -f mp3 -ab 192000 -vn out2.mp3 #14M

ffmpeg -i mad-principio_peter.mp4 -f mp3 -ab 128000 -vn out3.mp3 #9M
ffmpeg -i mad-principio_peter.mp4 -vn -acodec libmp3lame out4.mp3 #9M

ffmpeg -i mad-principio_peter.mp4 -acodec libmp3lame -ab 128k out5.mp3 #9M

ffmpeg -i gym.mp4 -f webm -c:v libvpx -b:v 1M -acodec libvorbis gym.webm -hide_banner

Second

ffmpeg -i sample.avi -q:a 0 -map a sample.mp3  #complete

ffmpeg -i sample.avi -ss 00:03:05 -t 00:00:45.0 -q:a 0 -map a sample.mp3 #fraction

Parameters :

-q:a 0 for variable bit rate

-ss starting timestamp

-t  the encoding time (If you don't specify, it will go to the end)

-map 0:a:3 selects audio stream #4 (ffmpeg starts counting from 0) 

** specific the timestamps in HH:MM:SS.xxx format.

 

References:

[1] https://json2video.com/how-to/ffmpeg-course/ffmpeg-extract-audio.html

Download zip file from Google Drive

 First

Share your file in GD (with anybody access by link) and get FILEID

Second

Execute next code(replace FILEID and choose FILENAME):

wget --load-cookies /tmp/cookies.txt "https://docs.google.com/uc?export=download&confirm=$(wget --quiet --save-cookies /tmp/cookies.txt --keep-session-cookies --no-check-certificate 'https://docs.google.com/uc?export=download&id=FILEID' -O- | sed -rn 's/.*confirm=([0-9A-Za-z_]+).*/\1\n/p')&id=FILEID" -O FILENAME && rm -rf /tmp/cookies.txt

 

Note:

Previous methods doesn't work, because now GD needs confirmation, then using cookies it's possible.

Ubuntu NFS Installation

On Server (10.10.7.229):

$ sudo apt install nfs-kernel-server  #install server

$ sudo mkdir -p /mnt/nfs_drive  #create share point

$ sudo chown -R nobody:nogroup /mnt/nfs_drive  #no owner

$ sudo chmod 777 /mnt/nfs_drive  #set r/w permission

$ sudo vi /etc/exports  #define clients grants
 

/mnt/nfs_drive 10.10.7.218(rw,sync,no_subtree_check) #mine
/mnt/nfs_drive 10.10.7.235(rw,sync,no_subtree_check) #houdini

$ sudo exportfs -a

$ sudo systemctl restart nfs-kernel-server
 

On Client: 

$ sudo apt install nfs-common 

$ sudo mkdir -p /mnt/nfs_drive_client   #mirror

$ sudo mount 10.10.7.229:/mnt/nfs_drive /mnt/nfs_drive_client

Notes: 

$ sudo ufw status  #verify the firewall, more details in reference[0]

References: 

[0] Working https://linuxhint.com/install-and-configure-nfs-server-ubuntu-22-04/

[1] https://www.tecmint.com/install-nfs-server-on-ubuntu/

qemu bridge to enable network during simulation

 Install brctl

 sudo apt install bridge-utils

Add new virtual bridge

sudo brctl addbr virbr0
sudo brctl addif virbr0 eth0 

Check

/etc/qemu-ifup and /etc/qemu-ifdown  #files
 

 

 

 

Gimp Python-Fu

 

[0] https://www.gimp.org/docs/python/index.html#PREGION-OBJECT-MEMBERS

[1] https://www.gimp.org/docs/python/index.html#DRAWABLE-OBJECT-METHODS

[2] http://myvirtualbrain.blogspot.com/2012/06/gimp-python-fu-very-basics.html 

[3] Samples https://github.com/jfmdev/PythonFuSamples

[4] https://github.com/gummyCowboy/GIMP-python-fu

[5] https://gist.github.com/garystafford/5259576a7e9299d5b80284489aa25fc3

Ubuntu upgrade cmake

 

1. Download https://cmake.org/download/

2. Unpack and enter to folder to execute commands

./bootstrap
make -j$(nproc)
sudo make install

 References

[1] https://askubuntu.com/questions/355565/how-do-i-install-the-latest-version-of-cmake-from-the-command-line

 

Linux: Debuging and Inspecting binary files and libraries

 

 

$ nm libmanson.so | grep -n apply
1:00000000000058ef T apply

 

Linux Libraries path

#Cuda 8.0 Settings
export CUDA_HOME=/usr/local/cuda-8.0
export LD_LIBRARY_PATH=${CUDA_HOME}/lib64  
PATH=${CUDA_HOME}/bin:${PATH}


#Cuda 9.1 Settings
export CUDA_HOME=/usr/local/cuda-9.1
export LD_LIBRARY_PATH=${CUDA_HOME}/lib64  
PATH=${CUDA_HOME}/bin:${PATH}


#Cuda 9.2 Settings
export CUDA_HOME=/usr/local/cuda-9.2
export LD_LIBRARY_PATH=${CUDA_HOME}/lib64  
PATH=${CUDA_HOME}/bin:${PATH}

 

$ LD_LIBRARY_PATH=. ./programtest  #direct execution
 

$ echo $LD_LIBRARY_PATH  
/usr/local/cuda-8.0/lib64
 

$ ls /etc/ld.so.conf.d
cuda-8-0.conf                   opencv.conf
fakeroot-x86_64-linux-gnu.conf  x86_64-linux-gnu.conf
glew.conf                       x86_64-linux-gnu_EGL.conf
i386-linux-gnu.conf             x86_64-linux-gnu_GL.conf
libc.conf                       zz_i386-biarch-compat.conf

$ldconfig -p  #list libraries

$sudo ldconfig #update paths

 

 


 

Update Chrome in Ubuntu

 

# Install

# via http://askubuntu.com/questions/510056/how-to-install-google-chrome

wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - 

sudo sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'

sudo apt-get update 

sudo apt-get install google-chrome-stable

# Update

sudo apt-get --only-upgrade install google-chrome-stable

Video tools online

Rotate/Crop/Resize

[1] https://ezgif.com/rotate-video

[2] Fast https://www.rotatevideo.org/