Comment 4 for bug 1772746

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Andrius Merkys (andriusmerkys) wrote : Re: After upgrade to 18.04, all pip and pip3 commands fail

It seems that pip was updated using 'pip install -U pip', what made user- and system-wide installations of pip out-of-sync. It should be noted, however, that pip can only be updated using APT, as updating via pip itself risks breaking the package. It might be wise to implement a big warning upon issuing 'pip install -U pip'.

Will forward this to Debian.