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Using following order I solved for Ubuntu 20.04 and ROS Noetic my problem after getting [rospack] Error: the rosdep view is empty: call 'sudo rosdep init' and 'rosdep update':

1: $ rosdep update

Command 'rosdep' not found, but can be installed with:

sudo apt install python3-rosdep2

2: $ sudo apt install python3-rosdep2

0 upgraded, 1 newly installed, 150 to remove and 301 not upgraded. Need to get 52.8 kB of archives. After this operation, 89.6 MB disk space will be freed. Do you want to continue? [Y/n] y

3: $ rosdep update

4: $ sudo apt install ros-noetic-desktop-full

0 upgraded, 150 newly installed, 1 to remove and 301 not upgraded. Need to get 16.8 MB of archives. After this operation, 89.6 MB of additional disk space will be used. Do you want to continue? [Y/n] y

Hope it helps

Using following order I solved for Ubuntu 20.04 and ROS Noetic my problem after getting getting:

[rospack] Error: the rosdep view is is empty: call 'sudo rosdep init' and and 'rosdep update':

1: $ rosdep update

update'

1:

$ rosdep update

Command 'rosdep' not found, but can be installed with:

sudo apt install python3-rosdep2

2: 2:

$ sudo apt install python3-rosdep2

python3-rosdep2

0 upgraded, 1 newly installed, 150 to remove and 301 not upgraded. Need to get 52.8 kB of archives. After this operation, 89.6 MB disk space will be freed. Do you want to continue? [Y/n] y

3: $ rosdep update

$ rosdep update

4:

$ sudo apt install ros-noetic-desktop-full

ros-noetic-desktop-full

0 upgraded, 150 newly installed, 1 to remove and 301 not upgraded. Need to get 16.8 MB of archives. After this operation, 89.6 MB of additional disk space will be used. Do you want to continue? [Y/n] y

Hope it helps

helps.