on kubuntu 20.04

[mhdkhubbi]

I got this when installing
Package com.github.babluboy.nutty is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'com.github.babluboy.nutty' has no installation candidate
any solution?

[fractalf]

I have the same here on Linux Mint 20 (based on ubuntu 20.04)

Full set of commands for debug:

❯ sudo apt-add-repository ppa:bablu-boy/nutty 
You are about to add the following PPA:
 Stable PPA for Nutty - A Network Utility
 More info: https://launchpad.net/~bablu-boy/+archive/ubuntu/nutty
Press Enter to continue or Ctrl+C to cancel

Executing: /tmp/apt-key-gpghome.pDnSIYTqDe/gpg.1.sh --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys 67995A980C0F740716B33F4BC3234B3819D52D77
gpg: key C3234B3819D52D77: "Launchpad PPA for Siddhartha Das" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1

❯ apt update      
...
Get:17 http://ppa.launchpad.net/bablu-boy/nutty/ubuntu focal InRelease [18,1 kB]           
Get:33 http://ppa.launchpad.net/bablu-boy/nutty/ubuntu focal/main amd64 Packages [444 B]
Get:34 http://ppa.launchpad.net/bablu-boy/nutty/ubuntu focal/main i386 Packages [444 B]
Get:35 http://ppa.launchpad.net/bablu-boy/nutty/ubuntu focal/main Translation-en [224 B]
...
Fetched 19,2 kB in 3s (5 621 B/s)                  
Reading package lists... Done
Building dependency tree       
Reading state information... Done
27 packages can be upgraded. Run 'apt list --upgradable' to see them.

❯ apt search nutty
p   nutty                                 - Nutty                                           

❯ apt install nutty                    
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:
 nutty : Depends: com.github.babluboy.nutty but it is not installable
E: Unable to correct problems, you have held broken packages.

❯ apt install com.github.babluboy.nutty     
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package com.github.babluboy.nutty is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'com.github.babluboy.nutty' has no installation candidate

[babluboy]

Thanks for raising this issue. Here is Nutty's launchpad build page for the stable version:
https://code.launchpad.net/~bablu-boy/+archive/ubuntu/nutty.0.1

Try with the following PPA:
sudo add-apt-repository ppa:bablu-boy/nutty.0.1
sudo apt-get update

Or try the instructions here to build from source, that should work.
https://babluboy.github.io/nutty/#install