Showing posts with label ubuntu. Show all posts
Showing posts with label ubuntu. Show all posts

Ubuntu Error constructing proxy for org.gnome.Terminal

If the terminal fails to start when using Ubuntu desktop via VNC Server. If you see the below error in ~/.vnc/<some-ip>.log.

Ubuntu org.gnome.Terminal:/org/gnome/Terminal/Factory0: Error calling StartServiceByName

Error constructing proxy for org.gnome.Terminal: /org/gnome/Terminal/Factory0: 
Error calling StartServiceByName for org.gnome.Terminal: 
GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: 
Process /usr/lib/gnome-terminal/gnome-terminal-server exited with status 8 

Instead of using gnome-terminal use urxvt

sudo apt-get update
sudo apt-get install rxvt-unicode

Launch urxvt by adding it to the `~/.vnc/xstartup` vim ~/.vnc/xstartup
#!/bin/sh

export XKL_XMODMAP_DISABLE=1
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey

vncconfig -iconic &
gnome-panel &
gnome-settings-daemon &
metacity &
nautilus &
gnome-terminal &
urxvt &

Restart VNCSERVER session
vncserver -kill :1

vncserver :1

Build OpenVINO from source - Linux

Official Instructions - Click Here

Build instructions for OpenVINO from Source with the Python API Wrapper

OpenVINO 2022.1.0 and later require GLIBC 2.27+, check with `ldd --version`

Here instructions are for Python 3.7, you can change it to 3.6 as well.

Software Requirements:

- CMake 3.13 or higher
- GCC 7.5 or higher to build OpenVINO Runtime
- Python 3.6 or higher for OpenVINO Runtime Python API
- (Optional) Install Intel® Graphics Compute Runtime for OpenCL™ Driver package 19.41.14441 to enable inference on Intel integrated GPUs.


$ sudo apt-get install python3.7-dev

$ pip install cython numpy

$ cd ~ #openvino will be installed in ~/openvino

$ git clone https://github.com/openvinotoolkit/openvino.git
$ cd openvino
$ git submodule update --init --recursive
$ chmod +x install_dependencies.sh
$ ./install_dependencies.sh
$ mkdir build && cd build

$ cmake -DCMAKE_BUILD_TYPE=Release \
-DENABLE_INTEL_GNA=OFF -DENABLE_INTEL_MYRIAD_COMMON=OFF \
-DENABLE_PYTHON=ON \
-DPYTHON_EXECUTABLE=`which python3.7` \
-DPYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.7m.so \
-DPYTHON_INCLUDE_DIR=/usr/include/python3.7 ..

$ make --jobs=$(nproc --all)

$ export PYTHONPATH=$PYTHONPATH:~/openvino/bin/intel64/Release/lib/python_api/python3.7/
$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:~/openvino/bin/intel64/Release/lib/

# OR Install the wheel with PIP
$ pip install ~/openvino/build/wheel/*.whl

# TEST BUILD
$ python3.7
>>> from openvino.inference_engine import IENetwork, IECore

# Test Benchmark app

$ alias benchmark_app=~/openvino/bin/intel64/Release/benchmark_app 
$ benchmark_app -h

Install Python3.6 or Python3.7 in Ubuntu 20.04; ImportError: libpython3.6m.so.1.0: cannot open shared object file

Ubuntu 20.04 has Python 3.8 by default. 
See below to install Python 3.6 or 3.7

sudo -E add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-get install python3.6
sudo apt-get install -y libpython3.6-dev

Install like above if you get below error

ImportError: libpython3.6m.so.1.0: cannot open shared object file: No such file or directory


Host a static website in Ubuntu using Nginx

 Install Ngnix Web Server

sudo apt-get install nginx

Controlling Nginx

sudo systemctl start nginx
sudo systemctl stop nginx
sudo systemctl restart nginx
sudo systemctl reload nginx

Firewall

sudo ufw allow 'Nginx Full'
sudo ufw reload

Nginx Configuration Directory

cd /etc/nginx
sudo cp nginx.conf nginx.conf.bak

sudo nano nginx.conf

Verify this line is uncommented, include /etc/nginx/sites-enabled/*;

cd sites-available
sudo nano default

server { listen 80 default_server; listen [::]:80 default_server; server_name _; root /home/ravi/www/html; index index.html; location / { # First attempt to serve request as file, then # as directory, then fall back to displaying a 404. try_files $uri $uri/ =404; } }

Restart Server

sudo systemctl restart nginx


Ubuntu 18.04: Create/Modify SWAP partition memory limit.

Common error:
fallocate: fallocate failed: Text file busy in ubuntu OS 

Check the allocation:
free -m
or
sudo swapon --show

Make sure you have enough free disk space by
df -h

Disable the use of swap, allocate new swap space, enable swap.
sudo swapoff -a

sudo fallocate -l 8G /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile

Check the allocation:
free -m
or
sudo swapon --show

For detailed information: https://www.digitalocean.com/community/tutorials/how-to-add-swap-space-on-ubuntu-18-04

Connecting to Ubuntu Remote Desktop from Mac OS

Connecting to Ubuntu or any linux server via Mac OS:
-- Access the "Spotlight" by hitting CMD + Space-bar
-- Within the Spotlight field, enter vnc://your_server_ip:5900

If you get an error when connecting to Ubuntu from Mac OS using VNC screen sharing:
"The software on the remote computer appears to be incompatible with this version of Screen Sharing."
On Ubuntu 18.04:
$ gsettings set org.gnome.Vino require-encryption false
Verify the setting with
$ gsettings list-recursively org.gnome.Vino | grep encrypt

BIOS settings to Install Ubuntu

If Ubuntu installation shows only the USB drive from which you are installing, make sure you have the BIOS settings as follows.
BIOS settings to Install Ubuntu alongside with Windows :
  1. Disable Secure Boot.
  2. Set SATA-controller to AHCI from RAID On.
  3. Set boot mode to legacy from UEFI.

Python contextlib for Timing Python code

If you've ever found yourself needing to measure the execution time of specific portions of your Python code, the `contextlib` module o...