After you’ve upgraded your Ubuntu machine a few times, you might find that free disk space is low and some Python commands have issues. Programs like Bleachbit can help you clear old packages or cache that you don’t need, but sometimes you need a minor manual fix as documented here. As you may know, Pip is the main package management you’ll use to install packages you use, so this can be problematic.
After upgrading 16.04 to 18.04, I got an error on command line “pip”:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 574, in _build_master
ws.require(__requires__)
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 892, in require
needed = self.resolve(parse_requirements(requirements))
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 783, in resolve
raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.VersionConflict: (pip 9.0.1 (/usr/lib/python3/dist-packages), Requirement.parse('pip==8.1.1'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/bin/pip", line 5, in <module>
from pkg_resources import load_entry_point
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3088, in <module>
@_call_aside
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3072, in _call_aside
f(*args, **kwargs)
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3101, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 576, in _build_master
return cls._build_from_requirements(__requires__)
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 589, in _build_from_requirements
dists = ws.resolve(reqs, Environment())
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 778, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pip==8.1.1' distribution was not found and is required by the application
and pip3 (python3):
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 574, in _build_master
ws.require(__requires__)
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 892, in require
needed = self.resolve(parse_requirements(requirements))
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 783, in resolve
raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.VersionConflict: (pip 9.0.1 (/usr/lib/python3/dist-packages), Requirement.parse('pip==8.1.1'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/bin/pip3", line 5, in <module>
from pkg_resources import load_entry_point
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3088, in <module>
@_call_aside
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3072, in _call_aside
f(*args, **kwargs)
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3101, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 576, in _build_master
return cls._build_from_requirements(__requires__)
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 589, in _build_from_requirements
dists = ws.resolve(reqs, Environment())
File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 778, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pip==8.1.1' distribution was not found and is required by the application
Whereis command shows one command that works (and in fact you can see in properties in Synaptic that python-pip installs /usr/bin/pip3, /usr/bin/pip, /usr/bin/pip2):
$ whereis pip
pip: /usr/bin/pip /usr/local/bin/pip2.7 /usr/local/bin/pip3.5 /usr/local/bin/pip3.4 /usr/local/bin/pip /usr/share/man/man1/pip.1.gz
$ whereis pip3
pip3: /usr/bin/pip3 /usr/local/bin/pip3 /usr/local/bin/pip3.5 /usr/local/bin/pip3.4 /usr/share/man/man1/pip3.1.gz
Rather than remove these files, you should move them, which seems the same to the computer but allows you to move them back if you later find something on your system was using it:
sudo mv /usr/local/bin/pip3.4 ~/bkupUsrLocalBinPip3.4
sudo mv /usr/local/bin/pip3.5 ~/bkupUsrLocalBinPip3.5
sudo mv /usr/local/bin/pip ~/bkupUsrLocalBinPip
sudo mv /usr/local/bin/pip3 ~/bkupUsrLocalBinPip3The linked virtualenv command also was old so I moved it:
$ ls -lah /usr/local/bin/virtualenv
-rwxr-xr-x 1 root root 319 May 10 2014 /usr/local/bin/virtualenv
As discussed here, there is a trend to use “python3 -m (module)” to be clear rather than using “virtualenv” or “pip” command by itself – so instead of running “virtualenv (arguments)” try “python3 -m virtualenv (arguments)”. And this works! So instead of the command in the example document:
virtualenv -p python3 $HOME/tmp/deepspeech-venv/to start off a virtualenv (separating your module installations in a directory instead of installing system-wide), you would run
python3 -m virtualenv -p python3 $HOME/tmp/deepspeech-venv/after “pip3 install virtualenv” is run, making sure that you have that module.