Having issues with installations of catkin tools

edit

I am using the latest Ubuntu 20.04.1 LTS and installed ROS noetic using the tutorial using the commands:

sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
sudo apt update
sudo apt install ros-noetic-desktop-full
echo "source /opt/ros/noetic/setup.bash" >> ~/.bashrc
source ~/.bashrc

ashwani@ashwani:~$ printenv | grep ROS

ROS_VERSION=1
ROS_PYTHON_VERSION=3
ROS_PACKAGE_PATH=/opt/ros/noetic/share
ROSLISP_PACKAGE_DIRECTORIES=
ROS_ETC_DIR=/opt/ros/noetic/etc/ros
ROS_MASTER_URI=http://localhost:11311
ROS_ROOT=/opt/ros/noetic/share/ros
ROS_DISTRO=noetic

Then I tried to install catkin thing which handles the workspace

sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu `lsb_release -sc` main" > /etc/apt/sources.list.d/ros-latest.list'
wget http://packages.ros.org/ros.key -O - | sudo apt-key add -
sudo apt-get update
sudo apt-get install python-catkin-tools

it shows error:

ashwani@ashwani:~$ sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu `lsb_release -sc` main" > /etc/apt/sources.list.d/ros-latest.list'
ashwani@ashwani:~$ wget http://packages.ros.org/ros.key -O - | sudo apt-key add -
--2020-10-30 18:09:07--  http://packages.ros.org/ros.key
Resolving packages.ros.org (packages.ros.org)... 2600:3402:200:227::2, 2605:bc80:3010::134, 2600:3404:200:237::2, ...
Connecting to packages.ros.org (packages.ros.org)|2600:3402:200:227::2|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1167 (1.1K)
Saving to: ‘STDOUT’

-                   100%[===================>]   1.14K  --.-KB/s    in 0s      

2020-10-30 18:09:08 (45.7 MB/s) - written to stdout [1167/1167]

OK
ashwani@ashwani:~$ sudo apt-get update
Hit:1 http://in.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://in.archive.ubuntu.com/ubuntu focal-updates InRelease              
Hit:3 http://in.archive.ubuntu.com/ubuntu focal-backports InRelease            
Hit:4 http://packages.ros.org/ros/ubuntu focal InRelease                       
Hit:5 http://archive.canonical.com/ubuntu focal InRelease                      
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease
Reading package lists... Done                 

ashwani@ashwani:~$ sudo apt-get install python-catkin-tools
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 python-catkin-tools : Depends: python-catkin-pkg (>= 0.2.9) but it is not installable
                       Depends: python-osrf-pycommon but it is not installable
 E: Unable to correct problems, you have held broken packages.

A look at bashrc:

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'
'
# some more ls aliases
alias ll='ls -alF'
alias la='ls -A'
alias l='ls -CF'

# Add an "alert" alias for long running commands.  Use like so:
#   sleep 10; alert
alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(h>

# Alias definitions.
# You may want to put all your ...