how to fix

hello sir, how to fix? im newbie

You might want to run ‘apt --fix-broken install’ to correct these.
The following packages have unmet dependencies:
python : PreDepends: python-minimal (= 2.7.15~rc1-1) but 2.7.15-3 is installed
python-all : Depends: python (= 2.7.15-3) but 2.7.15~rc1-1 is installed
python-all-dev : Depends: python (= 2.7.15-3) but 2.7.15~rc1-1 is installed
Depends: libpython-all-dev (= 2.7.15-3) but 2.7.15~rc1-1 is installed
python-dev : Depends: python (= 2.7.15-3) but 2.7.15~rc1-1 is installed
Depends: libpython-dev (= 2.7.15-3) but 2.7.15~rc1-1 is installed
Depends: python2.7-dev (>= 2.7.15-1~) but 2.7.15~rc1-1 is installed
Depends: python2-dev (= 2.7.15-3) but it is not installable
python-minimal : Depends: python2.7-minimal (>= 2.7.15-1~) but 2.7.15~rc1-1 is installed
python2-minimal : Depends: python2.7-minimal (>= 2.7.15-1~) but 2.7.15~rc1-1 is installed
Recommends: python2 but it is not installable
E: Unmet dependencies. Try ‘apt --fix-broken install’ with no packages (or specify a solution).

what are you trying to install?

It should be preinstalled on the system.

Are you upgraded the OS ?
sudo apt update
sudo apt dist-upgrade

it tells you what to do
sudo apt --fix-broken install
then try
sudo dpkg -configure -a
then
sudo apt clean
sudo apt update
sudo apt full-upgrade