Upgrade to Ubuntu 20.04 killed pip

问题

I upgraded to Ubuntu 20.04 from 19.10 and now I cannot use pip.

zeno:~$ pip --version

Command 'pip' not found, but there are 18 similar ones.

Python is installed:

zeno:~$ python3 --version
Python 3.8.2

but if I try to insatll pip, I get this:

    zeno:~/Desktop/tetris$ sudo apt install python3-pip
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    python3-pip is already the newest version (20.0.2-5ubuntu1).
    The following packages were automatically installed and are no longer required:
     dh-python elpa-async enchant gedit-plugin-zeitgeist gir1.2-mutter-5
     gnome-software-common libappstream-glib8 libapt-pkg5.90
     libboost-date-time1.67.0 libboost-iostreams1.67.0 libbrlapi0.6
     libcodec2-0.8.1 libcroco3 libdns-export1104 libdns1104 libdvdread4
     libegl1-mesa libenchant1c2a libept1.5.90 libevent-2.1-6 libexiv2-14
     libfprint0 libgeoip1 libgit2-27 libglvnd-core-dev libgnome-desktop-3-18
     libgspell-1-1 libgutenprint-common libgutenprint9 libgweather-3-15 libicu63
     libiptc0 libisc-export1100 libisc1100 libisc1105 libisl21 liblivemedia64
     liblouis17 liblwres161 libmicrodns0 libmozjs-60-0 libmutter-5-0 libmysofa0
     libnettle6 liboauth0 libperl5.28 libplymouth4 libpoppler90
     libpython3.7-minimal libqpdf21 libsnmp30 libusbmuxd4 libx11-xcb-dev
     libx265-176 libxcb-dri2-0-dev libxcb-dri3-dev libxcb-shape0-dev
     libxcb-sync-dev libxcb-xfixes0-dev libxshmfence-dev libzeitgeist-2.0-0
     perl-modules-5.28 printer-driver-gutenprint python-gobject-2
     python3-asn1crypto python3-pypdf2 python3.7-minimal ubuntu-system-service
     x11proto-composite-dev x11proto-fixes-dev
   Use 'sudo apt autoremove' to remove them.
   0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I am lost. Thanks for any help

Update

I use venv to create virtual environments. When no venv is activated, I can use pip3:

zeno:~/Desktop/tetris$ pip3 -V
pip 20.0.2 from /usr/lib/python3/dist-packages/pip (python 3.8)

but if I activate a venv, it does not work:

(.tetris) zeno:~/Desktop/tetris$ pip3
Traceback (most recent call last):
  File "/home/zeno/Desktop/tetris/.tetris/bin/pip3", line 6, in <module>
    from pip._internal import main
ModuleNotFoundError: No module named 'pip'

Thank you for your suggestions and continued help.

Update

I tried deleting the venv and making a new one, but it seems I need pip working in order to do that:

zeno:~/Desktop/tetris$ python3 -m venv .tetris

gives:

The virtual environment was not created successfully because ensurepip is not
available.  On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.

    apt-get install python3-venv

You may need to use sudo with that command.  After installing the python3-venv
package, recreate your virtual environment.

Failing command: ['/home/zeno/Desktop/tetris/.tetris/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']

回答1:

Sometimes after OS upgrade you need to reinstall packages. Try:

sudo apt install --reinstall python3-pip

回答2:

I had to purge python3-venv and reinstall it:

zeno:~$ sudo apt purge python3-venv

and then

zeno:~$ sudo apt install python3-venv

Thanks all

回答3:

First, purge the python3-pip

sudo apt purge python3-pip

Second, Install the python3-pip

sudo apt install python3-pip

Finished

回答4:

The solution that worked best for me was given by dobairoland over on the esp-idf github (issue 4474) as found in the Espressif Docs:

sudo apt-get install python3 python3-pip python3-setuptools

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 10

Alternative (1): At first I and was able to work around this with an alias for a 3rd party bash install script that was hardcoded with pip (none of the installs / re-installs previously mentioned worked for me) - so this could be an option, too:

sudo apt-get install python3-pip
alias pip="pip3"

this (admittedly less-than-graceful option) might be helpful in scripts:

if [ "$(cat /etc/os-release | grep VERSION_ID)" == 'VERSION_ID="20.04"' ]; then
 alias pip="pip3"
else 
  echo "no pip alias"
fi

Alternative (2) There's also this hack that technically worked for me, but is probably not a good idea to force deprecated software onto a system:

wget https://bootstrap.pypa.io/get-pip.py
sudo python2.7 get-pip.py

来源：https://stackoverflow.com/questions/61699983/upgrade-to-ubuntu-20-04-killed-pip

标签

python

pip

ubuntu-20.04