我想卸载 3.6 版本，但不触及原始 3.5 版本。所以我运行了
sudo apt-get remove python3.6
但输出是：
E: Unable to locate package python3.6
E: Couldn't find any package by glob 'python3.6'
E: Couldn't find any package by regex 'python3.6'
$ dpkg -l python3.6
dpkg-query: no packages found matching python3.6
$ dpkg -l python3
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-=================================
ii python3 3.5.1-3 amd64 interactive high-level object-ori
$ apt-cache policy python3
python3:
Installed: 3.5.1-3
Candidate: 3.5.1-3
Version table:
*** 3.5.1-3 500
500 http://in.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
100 /var/lib/dpkg/status
我的目标描述为Ubuntu 16.04：似乎无法使 numpy 在 python 3.6.5 中工作，但它在 python 2.7.12 中运行良好。我无法让我的代码在 python2.7、python3.5 或 python 3.6 中运行。只要我能运行我的代码，任何 Python 版本都可以。
$ type python
python is hashed (/usr/bin/python)
$ type python3
python3 is hashed (/usr/local/bin/python3)
$ type python3.6
python3.6 is hashed (/usr/local/bin/python3.6)
$ apt list --installed 'python*'
Listing... Done
python/xenial-updates,now 2.7.12-1~16.04 amd64 [installed]
python-all/xenial-updates,now 2.7.12-1~16.04 amd64 [installed,automatic]
python-all-dev/xenial-updates,now 2.7.12-1~16.04 amd64 [installed,automatic]
python-apt-common/xenial-updates,xenial-updates,now 1.1.0~beta1ubuntu0.16.04.1 all [installed]
python-crypto/xenial-updates,xenial-security,now 2.6.1-6ubuntu0.16.04.3 amd64 [installed]
python-dbus/xenial,now 1.2.0-3 amd64 [installed,automatic]
python-dev/xenial-updates,now 2.7.12-1~16.04 amd64 [installed,automatic]
python-gi/xenial,now 3.20.0-0ubuntu1 amd64 [installed,automatic]
python-ldb/xenial,now 2:1.1.24-1ubuntu3 amd64 [installed]
python-minimal/xenial-updates,now 2.7.12-1~16.04 amd64 [installed]
python-numpy/xenial,now 1:1.11.0-1ubuntu1 amd64 [installed]
python-pip/xenial-updates,xenial-updates,now 8.1.1-2ubuntu0.4 all [installed]
python-pip-whl/xenial-updates,xenial-updates,now 8.1.1-2ubuntu0.4 all [installed,automatic]
python-pkg-resources/xenial,xenial,now 20.7.0-1 all [installed,automatic]
python-pyatspi/xenial,xenial,now 2.18.0+dfsg-3 all [installed,automatic]
python-samba/xenial-updates,xenial-security,now 2:4.3.11+dfsg-0ubuntu0.16.04.13 amd64 [installed]
python-setuptools/xenial,xenial,now 20.7.0-1 all [installed,automatic]
python-talloc/xenial,now 2.1.5-2 amd64 [installed]
python-tdb/xenial,now 1.3.8-2 amd64 [installed]
python-wheel/xenial,xenial,now 0.29.0-1 all [installed,automatic]
python2.7/xenial-updates,now 2.7.12-1ubuntu0~16.04.3 amd64 [installed]
python2.7-dev/xenial-updates,now 2.7.12-1ubuntu0~16.04.3 amd64 [installed,automatic]
python2.7-minimal/xenial-updates,now 2.7.12-1ubuntu0~16.04.3 amd64 [installed]
python3/xenial,now 3.5.1-3 amd64 [installed]
python3-apport/xenial-updates,xenial-updates,now 2.20.1-0ubuntu2.17 all [installed]
python3-apt/xenial-updates,now 1.1.0~beta1ubuntu0.16.04.1 amd64 [installed]
python3-aptdaemon/xenial,xenial,now 1.1.1+bzr982-0ubuntu14 all [installed]
python3-aptdaemon.gtk3widgets/xenial,xenial,now 1.1.1+bzr982-0ubuntu14 all [installed]
python3-aptdaemon.pkcompat/xenial,xenial,now 1.1.1+bzr982-0ubuntu14 all [installed]
python3-blinker/xenial,xenial,now 1.3.dfsg2-1build1 all [installed]
python3-brlapi/xenial-updates,now 5.3.1-2ubuntu2.1 amd64 [installed]
python3-bs4/xenial,xenial,now 4.4.1-1 all [installed]
python3-cairo/xenial,now 1.10.0+dfsg-5build1 amd64 [installed]
python3-cffi-backend/xenial,now 1.5.2-1ubuntu1 amd64 [installed]
python3-chardet/xenial,xenial,now 2.3.0-2 all [installed]
python3-checkbox-support/xenial,xenial,now 0.22-1 all [installed]
python3-commandnotfound/xenial-updates,xenial-updates,now 0.3ubuntu16.04.2 all [installed]
python3-cryptography/xenial-updates,xenial-security,now 1.2.3-1ubuntu0.1 amd64 [installed]
python3-cups/xenial,now 1.9.73-0ubuntu2 amd64 [installed]
python3-cupshelpers/xenial,xenial,now 1.5.7+20160212-0ubuntu2 all [installed]
python3-dateutil/xenial,xenial,now 2.4.2-1 all [installed,automatic]
python3-dbus/xenial,now 1.2.0-3 amd64 [installed]
python3-debian/xenial,xenial,now 0.1.27ubuntu2 all [installed]
python3-defer/xenial,xenial,now 1.0.6-2build1 all [installed]
python3-dev/xenial,now 3.5.1-3 amd64 [installed,automatic]
python3-distupgrade/xenial-updates,xenial-updates,xenial-security,xenial-security,now 1:16.04.25 all [installed]
python3-feedparser/xenial,xenial,now 5.1.3-3build1 all [installed]
python3-gdbm/xenial,now 3.5.1-1 amd64 [installed]
python3-gi/xenial,now 3.20.0-0ubuntu1 amd64 [installed]
python3-gi-cairo/xenial,now 3.20.0-0ubuntu1 amd64 [installed]
python3-guacamole/xenial,xenial,now 0.9.2-1 all [installed]
python3-html5lib/xenial,xenial,now 0.999-4 all [installed]
python3-httplib2/xenial,xenial,now 0.9.1+dfsg-1 all [installed]
python3-icu/xenial,now 1.9.2-2build1 amd64 [installed]
python3-idna/xenial,xenial,now 2.0-3 all [installed]
python3-jinja2/xenial,xenial,now 2.8-1 all [installed]
python3-jwt/xenial-updates,xenial-updates,xenial-security,xenial-security,now 1.3.0-1ubuntu0.1 all [installed]
python3-louis/xenial-updates,xenial-updates,xenial-security,xenial-security,now 2.6.4-2ubuntu0.1 all [installed]
python3-lxml/xenial,now 3.5.0-1build1 amd64 [installed]
python3-mako/xenial,xenial,now 1.0.3+ds1-1ubuntu1 all [installed]
python3-markupsafe/xenial,now 0.23-2build2 amd64 [installed]
python3-minimal/xenial,now 3.5.1-3 amd64 [installed]
python3-oauthlib/xenial,xenial,now 1.0.3-1 all [installed]
python3-padme/xenial,xenial,now 1.1.1-2 all [installed]
python3-pam/xenial,now 0.4.2-13.2ubuntu2 amd64 [installed]
python3-pexpect/xenial,xenial,now 4.0.1-1 all [installed]
python3-pil/xenial-updates,xenial-security,now 3.1.2-0ubuntu1.1 amd64 [installed]
python3-pip/xenial-updates,xenial-updates,now 8.1.1-2ubuntu0.4 all [installed]
python3-pkg-resources/xenial,xenial,now 20.7.0-1 all [installed]
python3-plainbox/xenial,xenial,now 0.25-1 all [installed]
python3-problem-report/xenial-updates,xenial-updates,now 2.20.1-0ubuntu2.17 all [installed]
python3-ptyprocess/xenial,xenial,now 0.5-1 all [installed]
python3-pyasn1/xenial,xenial,now 0.1.9-1 all [installed]
python3-pyatspi/xenial,xenial,now 2.18.0+dfsg-3 all [installed]
python3-pycurl/xenial,now 7.43.0-1ubuntu1 amd64 [installed]
python3-pyparsing/xenial-updates,xenial-updates,now 2.0.3+dfsg1-1ubuntu0.1 all [installed]
python3-renderpm/xenial,now 3.3.0-1 amd64 [installed]
python3-reportlab/xenial,xenial,now 3.3.0-1 all [installed]
python3-reportlab-accel/xenial,now 3.3.0-1 amd64 [installed]
python3-requests/xenial,xenial,now 2.9.1-3 all [installed]
python3-setuptools/xenial,xenial,now 20.7.0-1 all [installed,automatic]
python3-six/xenial,xenial,now 1.10.0-3 all [installed]
python3-software-properties/xenial-updates,xenial-updates,now 0.96.20.7 all [installed]
python3-speechd/xenial,xenial,now 0.8.3-1ubuntu3 all [installed]
python3-systemd/xenial,now 231-2build1 amd64 [installed]
python3-tk/xenial,now 3.5.1-1 amd64 [installed]
python3-uno/xenial-updates,xenial-security,now 1:5.1.6~rc2-0ubuntu1~xenial3 amd64 [installed]
python3-update-manager/xenial-updates,xenial-updates,xenial-security,xenial-security,now 1:16.04.12 all [installed]
python3-urllib3/xenial-updates,xenial-updates,now 1.13.1-2ubuntu0.16.04.1 all [installed]
python3-wheel/xenial,xenial,now 0.29.0-1 all [installed,automatic]
python3-xdg/xenial,xenial,now 0.25-4 all [installed]
python3-xkit/xenial,xenial,now 0.5.0ubuntu2 all [installed]
python3-xlsxwriter/xenial,xenial,now 0.7.3-1 all [installed]
python3.5/xenial-updates,xenial-security,now 3.5.2-2ubuntu0~16.04.4 amd64 [installed]
python3.5-dev/xenial-updates,xenial-security,now 3.5.2-2ubuntu0~16.04.4 amd64 [installed,automatic]
python3.5-minimal/xenial-updates,xenial-security,now 3.5.2-2ubuntu0~16.04.4 amd64 [installed]
答案1
您的python3和python3.6二进制文件1安装在/usr/local/bin不是默认位置的位置，并且 dpkg (或 APT) 不知道它们。所以它们很可能不是由 dpkg 或 APT 安装的。要卸载它们，只需将它们从/usr/local/bin文件夹中删除即可。
初步检查
我建议先重命名它们：
sudo mv /usr/local/bin/python3 /usr/local/bin/python3.bak
sudo mv /usr/local/bin/python3.6 /usr/local/bin/python3.6.bak
然后运行时检查 APT 安装的版本是否启动python3：
python3 --version # expected output: Python 3.5.2
如果此检查成功，您可以安全地删除文件/usr/local/bin/python3.bak和/usr/local/bin/python3.6.bak。
1事实上，一个文件可能是另一个文件的符号链接。
答案2
我想你可以使用 :
sudo -i来找到你的根源
然后使用：
apt purge python3-minimal例如。
我今天这样做了，据我所知，它是有效的。
祝你好运