I tried to change my default python3 from 3.6 to 3.7 and I realized it's a bad decision since everything was messed up.
I then tried to bring it back to 3.6.9.
I also removed python3 and reinstalled it via the source.
now I can't install anything with apt-get install and I also can't do apt upgrade because it gives the following error: (there's a very verbose error but here's the summary:)
Errors were encountered while processing:
python3
python3-cffi-backend
python3-keyring
python3-crypto
python3-requests-unixsocket
python3-idna
python3-xdg
python3-update-manager
python3-keyrings.alt
python3-six
python3-certifi
python3-aptdaemon.gtk3widgets
python3-wheel
python3-pkg-resources
python3-gi
lsb-release
python3-apport
python3-defer
python3-problem-report
python3-asn1crypto
ubuntu-drivers-common
python3-configargparse
python3-debconf
software-properties-gtk
python3-chardet
python3-aptdaemon
python3-systemd
python3-all
aptdaemon
python3-httplib2
python3-pip
python3-requests
python3-software-properties
python3-urllib3
python3-setuptools
python3-lib2to3
python3-secretstorage
dh-python
python3-debian
python3-distutils
python3-distupgrade
python3-dateutil
python3-xkit
software-properties-common
python3-cryptography
python3-distro-info
python3-apt
python3-dbus
额外信息
ls -la /usr/bin | grep python:
lrwxrwxrwx 1 root root 39 مه 9 05:04 apt_pkg.cpython-36m-x86_64-linux-gnu.so -> apt_pkg.cpython-34m-x86_64-linux-gnu.so
lrwxrwxrwx 1 root root 26 مارس 27 2018 dh_pypy -> ../share/dh-python/dh_pypy
-rwxr-xr-x 1 root root 1056 آوریل 16 2018 dh_python2
lrwxrwxrwx 1 root root 23 آوریل 15 21:50 pdb2.7 -> ../lib/python2.7/pdb.py
lrwxrwxrwx 1 root root 23 آوریل 18 06:26 pdb3.6 -> ../lib/python3.6/pdb.py
lrwxrwxrwx 1 root root 23 نوامب 7 2019 pdb3.7 -> ../lib/python3.7/pdb.py
lrwxrwxrwx 1 root root 31 اكتبر 17 2019 py3versions -> ../share/python3/py3versions.py
lrwxrwxrwx 1 root root 26 مارس 27 2018 pybuild -> ../share/dh-python/pybuild
lrwxrwxrwx 1 root root 18 مه 9 16:10 python -> /usr/bin/python2.7
lrwxrwxrwx 1 root root 9 اكتبر 17 2019 python2 -> python2.7
-rwxr-xr-x 1 root root 3637096 آوریل 15 21:50 python2.7
lrwxrwxrwx 1 root root 33 آوریل 15 21:50 python2.7-config -> x86_64-linux-gnu-python2.7-config
lrwxrwxrwx 1 root root 16 آوریل 16 2018 python2-config -> python2.7-config
lrwxrwxrwx 1 root root 18 مه 9 16:07 python3 -> /usr/bin/python3.6
-rwxr-xr-x 1 root root 13326488 مه 9 14:30 python3.6
lrwxrwxrwx 1 root root 16 آوریل 16 2018 python-config -> python2.7-config
lrwxrwxrwx 1 root root 29 اكتبر 17 2019 pyversions -> ../share/python/pyversions.py
-rwxr-xr-x 1 root root 2971 آوریل 15 21:50 x86_64-linux-gnu-python2.7-config
lrwxrwxrwx 1 root root 33 آوریل 16 2018 x86_64-linux-gnu-python-config -> x86_64-linux-gnu-python2.7-config
Python版本：
~:> python -V
Python 2.7.17
~:> python3 -V
Python 3.6.9
备择方案：
python3：
#:> update-alternatives --config python3
There is only one alternative in link group python3 (providing /usr/bin/python3):
/usr/bin/python3.6
Nothing to configure.
update-alternatives: warning: forcing reinstallation of alternative /usr/bin/python3.6
because link group python3 is broken
python2：
#:> update-alternatives --config python
There is only one alternative in link group python (providing /usr/bin/python):
/usr/bin/python2.7
Nothing to configure.
update-alternatives: warning: forcing reinstallation of alternative /usr/bin/python2.7
because link group python is broken
