Adding Python deadsnakes ppa repository on Kubuntu Linux

apt-cache policy python3

sudo add-apt-repository ppa:deadsnakes/ppa

https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa

MAKE SURE your Linux version is supported: https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu/dists/

IF NOT, use latest supported version for ppa

sudo nano /etc/apt/sources.list.d/deadsnakes-ubuntu-ppa-jammy.list

deb https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu/ focal main
deb-src https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu/ focal main

sudo apt edit-sources // edit repositories

sudo nano /etc/apt/sources.list // edit repositories

ls /etc/apt/sources.list.d // list additional repositories files

/etc/apt/sources.list.d$ sudo dpkg --force-depends --purge libpython3.10-stdlib
dpkg: libpython3.10-stdlib:amd64: dependency problems, but removing anyway as you requested:
python3.10 depends on libpython3.10-stdlib (= 3.10.7-1ubuntu0.4).

(Reading database ... 254967 files and directories currently installed.)
Removing libpython3.10-stdlib:amd64 (3.10.7-1ubuntu0.4) ...
/etc/apt/sources.list.d$ sudo dpkg --force-depends --purge libpython3.10
dpkg: warning: ignoring request to remove libpython3.10 which isn't installed
/etc/apt/sources.list.d$ sudo dpkg --force-depends --purge libpython3.10-minimal
dpkg: libpython3.10-minimal:amd64: dependency problems, but removing anyway as you requested:
python3.10-minimal depends on libpython3.10-minimal (= 3.10.7-1ubuntu0.4).

(Reading database ... 254625 files and directories currently installed.)
Removing libpython3.10-minimal:amd64 (3.10.7-1ubuntu0.4) ...
Purging configuration files for libpython3.10-minimal:amd64 (3.10.7-1ubuntu0.4) ...
/etc/apt/sources.list.d$ sudo dpkg --force-depends --purge libpython3.10
dpkg: warning: ignoring request to remove libpython3.10 which isn't installed

/etc/apt/sources.list.d$ sudo apt install python3.10
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
python3.10 : Depends: python3.10-minimal (= 3.10.12-1+focal1) but 3.10.7-1ubuntu0.4 is to be installed
             Depends: libpython3.10-stdlib (= 3.10.12-1+focal1) but it is not going to be installed
python3.10-minimal : Depends: libpython3.10-minimal (= 3.10.7-1ubuntu0.4) but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

sudo apt purge python3.10

sudo apt purge python3.10-minimal

sudo aptitude

https://packages.ubuntu.com/kinetic/libpython3.10-stdlib

sudo dpkg -i libmpdec3_2.5.1-2build2_amd64.deb

sudo dpkg -i libpython3.10-minimal_3.10.7-1ubuntu0.4_amd64.deb

sudo dpkg -i libpython3.10-stdlib_3.10.7-1ubuntu0.4_amd64.deb

sudo apt --fix-broken install

Spent lot't of time and failed...

Change the Python3 default version in Ubuntu

cd /usr/bin

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.10 1

sudo update-alternatives --config python // choose python version

python3 --version

Python 3.10.7

sudo apt-get install --reinstall ca-certificates

See Technical details about this PPA => Signing key: => Fingerprint:

https://askubuntu.com/questions/1459362/how-to-resolve-the-key-not-available-error-on-deadsnakes-ppa

https://www.rosehosting.com/blog/how-to-install-and-switch-python-versions-on-ubuntu-20-04/

https://unix.stackexchange.com/questions/410579/change-the-python3-default-version-in-ubuntu

https://askubuntu.com/questions/1239829/modulenotfounderror-no-module-named-distutils-util