我想升级我的 python 版本，当通过 apt 更新什么也没做时，我决定构建最新版本的 Python 2 (2.7.16) 和 3 (3.7.2)。然而，在我这样做之前，不幸的是我决定删除我拥有的两个版本（2.7.15~rc1-1、3.6.7），所以我基本上破坏了我的系统。我可以很好地构建和安装新版本，但是当我重新启动时，GUI 没有加载。引导加载程序仍在工作，我可以进入终端。但是当尝试在这里遵循一些建议时（比如安装 ubuntu-desktop），我发现我无法连接到互联网（当我尝试安装软件包时无法解析主机名并且我无法 ping www. google.com）。我尝试使用启用网络的恢复模式，但没有区别。
我有机会修复我的系统吗？或者有什么方法可以使用 Ubuntu 安装 U 盘将系统重置为“出厂设置”（与以前相同的分区等），即使我必须删除那里的所有内容？我在双启动时运行 Windows 10 和 Ubuntu 18.04，尽管第一次安装过程非常顺利，但我之前在笔记本电脑上双启动 Windows 和 Ubuntu 时遇到了问题，现在我害怕我会导致甚至更大的伤害。如果有人可以帮助我，我会很高兴。
编辑#1：好像我还python3.6-minimal安装了，apt list --installed | grep 'python'输出：
libpython-stdlib/bionic,now 2.7.15~rc1-1 amd64 [installed,auto-removable]
libpython2.7/bionic-updates,bionic-security,now 2.7.15~rc1-1ubuntu0.1 amd64 [installed]
libpython2.7-minimal/bionic-updates,bionic-security,now 2.7.15~rc1-1ubuntu0.1 amd64 [installed]
libpython2.7-stdlib/bionic-updates,bionic-security,now 2.7.15~rc1-1ubuntu0.1 amd64 [installed]
libpython3-stdlib/bionic-updates,now 3.6.7-1~18.04 amd64 [installed]
libpython3.6/bionic-updates,now 3.6.7-1~18.04 amd64 [installed]
libpython3.6-minimal/bionic-updates,now 3.6.7-1~18.04 amd64 [installed]
libpython3.6-stdlib/bionic-updates,now 3.6.7-1~18.04 amd64 [installed]
python-apt-common/bionic-updates,bionic-updates,now 1.6.3ubuntu1 all [installed]
python-minimal/bionic,now 2.7.15~rc1-1 amd64 [installed,auto-removable]
python-talloc/bionic,now 2.1.10-2ubuntu1 amd64 [installed]
python2.7/bionic-updates,bionic-security,now 2.7.15~rc1-1ubuntu0.1 amd64 [installed]
python2.7-minimal/bionic-updates,bionic-security,now 2.7.15~rc1-1ubuntu0.1 amd64 [installed,automatic]
python3-minimal/bionic-updates,now 3.6.7-1~18.04 amd64 [installed]
python3.6/bionic-updates,now 3.6.7-1~18.04 amd64 [installed]
python3.6-minimal/bionic-updates,now 3.6.7-1~18.04 amd64 [installed]
还给ls /var/cache/apt/archive | grep 'python'了我：
python3-apt_1.6.3ubuntu1_amd64.deb
python3-distupgrade_1%3a18.04.30_all.deb
python3-gi_3.26.1-2ubuntu1_amd64.deb
python3-gi-cairo_3.26.1-2ubuntu1_amd64.deb
python3-update-manager_1%3a18.04.11.9_all.deb
python-apt-common_1.6.3ubuntu1_all.deb
我希望这有帮助。
编辑#2：会话日志来自/var/log/apt/term.log：
Log started: 2019-03-13 23:31:26
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Removing gnome-control-center (1:3.28.2-0ubuntu0.18.04.2) ...
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Removing nautilus-share (0.7.3-2ubuntu3) ...
Removing apturl (0.5.2ubuntu14.2) ...
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Removing command-not-found (18.04.5) ...
Removing firefox (65.0.1+build2-0ubuntu0.18.04.1) ...
Removing foomatic-db-compressed-ppds (20180306-1) ...
Removing gdm3 (3.28.3-0ubuntu18.04.4) ...
Removing gedit (3.28.1-1ubuntu1.1) ...
Removing gedit-common (3.28.1-1ubuntu1.1) ...
Removing ubuntu-session (3.28.1-0ubuntu3) ...
Removing update-notifier (3.192.1.5) ...
Removing update-manager (1:18.04.11.9) ...
Removing ubuntu-release-upgrader-gtk (1:18.04.30) ...
[1mdpkg:[0m aptdaemon: dependency problems, but removing anyway as you requested:
python3-aptdaemon depends on aptdaemon.
Removing aptdaemon (1.1.1+bzr982-0ubuntu19) ...
[1mdpkg:[0m python3-aptdaemon: dependency problems, but removing anyway as you requested:
python3-aptdaemon.gtk3widgets depends on python3-aptdaemon (= 1.1.1+bzr982-0ubuntu19).
Removing python3-aptdaemon (1.1.1+bzr982-0ubuntu19) ...
Selecting previously unselected package policykit-1-gnome.
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Removing ibus-table (1.9.14-3) ...
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Removing gnome-menus (3.13.3-11ubuntu1.1) ...
Removing gnome-online-accounts (3.28.0-0ubuntu2.1) ...
Removing ubuntu-software (3.28.1-0ubuntu4.18.04.8) ...
Removing gnome-software (3.28.1-0ubuntu4.18.04.8) ...
Removing nautilus-extension-gnome-terminal (3.28.2-1ubuntu1~18.04.1) ...
Removing xorg (1:7.7+19ubuntu7.1) ...
Removing gnome-terminal (3.28.2-1ubuntu1~18.04.1) ...
Removing printer-driver-postscript-hp (3.17.10+repack0-5) ...
Removing hplip (3.17.10+repack0-5) ...
Removing hplip-data (3.17.10+repack0-5) ...
[1mdpkg:[0m [1;33mwarning:[0m while removing hplip-data, directory '/usr/share/hplip/ui5' not empty so not removed
[1mdpkg:[0m [1;33mwarning:[0m while removing hplip-data, directory '/usr/share/hplip/scan' not empty so not removed
[1mdpkg:[0m [1;33mwarning:[0m while removing hplip-data, directory '/usr/share/hplip/prnt' not empty so not removed
[1mdpkg:[0m [1;33mwarning:[0m while removing hplip-data, directory '/usr/share/hplip/pcard' not empty so not removed
[1mdpkg:[0m [1;33mwarning:[0m while removing hplip-data, directory '/usr/share/hplip/installer' not empty so not removed
[1mdpkg:[0m [1;33mwarning:[0m while removing hplip-data, directory '/usr/share/hplip/fax' not empty so not removed
[1mdpkg:[0m [1;33mwarning:[0m while removing hplip-data, directory '/usr/share/hplip/copier' not empty so not removed
[1mdpkg:[0m [1;33mwarning:[0m while removing hplip-data, directory '/usr/share/hplip/base/pexpect' not empty so not removed
Removing ubuntu-standard (1.417) ...
Removing language-selector-common (0.188.1) ...
Removing xserver-xorg (1:7.7+19ubuntu7.1) ...
Removing python3-apport (2.20.9-0ubuntu7.5) ...
Removing update-notifier-common (3.192.1.5) ...
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[1mdpkg:[0m [1;33mwarning:[0m while removing update-manager-core, directory '/var/lib/update-manager' not empty so not removed
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[1mdpkg:[0m [1;33mwarning:[0m while removing netplan.io, directory '/etc/netplan' not empty so not removed
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update-initramfs: deferring update (trigger activated)
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Removing python3-aptdaemon.gtk3widgets (1.1.1+bzr982-0ubuntu19) ...
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Removing python3-cairo:amd64 (1.16.2-1) ...
Removing python3-macaroonbakery (1.1.3-1) ...
Removing python3-requests-unixsocket (0.1.5-3) ...
Removing python3-pymacaroons (0.13.0-1) ...
Removing python3-nacl (1.1.2-1build1) ...
Removing python3-cffi-backend (1.11.5-1) ...
Removing usb-creator-gtk (0.3.5) ...
Removing usb-creator-common (0.3.5) ...
Removing python3-debian (0.1.32) ...
Removing python3-commandnotfound (18.04.5) ...
Removing python3-keyrings.alt (3.0-1) ...
Removing python3-crypto (2.6.1-8ubuntu2) ...
Removing system-config-printer-udev (1.5.11-1ubuntu2) ...
Removing python3-cupshelpers (1.5.11-1ubuntu2) ...
Removing software-properties-common (0.96.24.32.7) ...
Removing python3-debconf (1.5.66) ...
Removing python3-defer (1.0.6-2build1) ...
Removing python3-distro-info (0.18) ...
Removing python3-gdbm:amd64 (3.6.7-1~18.04) ...
Removing totem-plugins (3.26.0-0ubuntu6.2) ...
Removing python3-lazr.restfulclient (0.13.5-1) ...
Removing python3-httplib2 (0.9.2+dfsg-1) ...
Removing python3-wadllib (1.3.2-3ubuntu0.18.04.1) ...
Removing python3-lazr.uri (1.0.3-2build1) ...
Removing python3-louis (3.5.0-1ubuntu0.3) ...
Removing rhythmbox-plugins (3.4.2-4ubuntu1) ...
Removing python3-mako (1.0.7+ds1-1) ...
Removing python3-markupsafe (1.0-1build1) ...
Removing python3-netifaces (0.10.4-0.1build4) ...
Removing python3-oauth (1.0.1-5) ...
Removing python3-olefile (0.45.1-1) ...
Removing python3-pexpect (4.2.1-1) ...
Removing python3-reportlab (3.4.0-3build1) ...
Removing python3-pil:amd64 (5.1.0-1) ...
Removing python3-zope.interface (4.3.2-1build2) ...
Removing python3-protobuf (3.0.0-9.1ubuntu1) ...
Removing python3-ptyprocess (0.5.2-1) ...
Removing python3-pyatspi (2.26.0+dfsg-1) ...
Removing python3-renderpm:amd64 (3.4.0-3build1) ...
Removing python3-reportlab-accel:amd64 (3.4.0-3build1) ...
Removing python3-rfc3339 (1.0-4) ...
Removing python3-simplejson (3.13.2-1) ...
Removing python3-software-properties (0.96.24.32.7) ...
Removing python3-speechd (0.8.8-1ubuntu1) ...
Removing python3-systemd (234-1build1) ...
Removing python3-tz (2018.3-2) ...
Removing python3-uno (1:6.0.7-0ubuntu0.18.04.2) ...
Removing python3-xdg (0.25-4ubuntu1) ...
Removing python3-xkit (0.5.0ubuntu2) ...
Removing python3-yaml (3.12-1build2) ...
Removing rhythmbox-plugin-alternative-toolbar (0.18.0-1) ...
Removing ubuntu-system-service (0.3.1) ...
Removing ufw (0.35-5) ...
Skip stopping firewall: ufw (not enabled)
Removing python3-requests (2.18.4-2ubuntu0.1) ...
Removing python3-certifi (2018.1.18-2) ...
Removing python3-chardet (3.0.4-1) ...
Removing python3-cups (1.9.73-2) ...
Removing python3-dbus (1.2.6-1) ...
Removing python3-gi (3.26.1-2ubuntu1) ...
Removing python3-idna (2.6-1) ...
Removing python3-pkg-resources (39.0.1-2) ...
Removing python3-urllib3 (1.22-1) ...
Removing python3-six (1.11.0-2) ...
Removing python3-distupgrade (1:18.04.30) ...
Removing python3-update-manager (1:18.04.11.9) ...
Removing lsb-release (9.20170808ubuntu1) ...
Removing python3-apt (1.6.3ubuntu1) ...
[1mdpkg:[0m gir1.2-ibus-1.0:amd64: dependency problems, but removing anyway as you requested:
gnome-shell depends on gir1.2-ibus-1.0 (>= 1.5.2); however:
Package gir1.2-ibus-1.0:amd64 is to be removed.
Removing gir1.2-ibus-1.0:amd64 (1.5.17-3ubuntu4) ...
[1mdpkg:[0m python3: dependency problems, but removing anyway as you requested:
gnome-shell depends on python3; however:
Package python3 is to be removed.
Removing python3 (3.6.7-1~18.04) ...
[1mdpkg:[0m gnome-shell: dependency problems, but removing anyway as you requested:
network-manager-gnome depends on policykit-1-gnome | polkit-1-auth-agent; however:
Package policykit-1-gnome is not configured yet.
Package polkit-1-auth-agent is not installed.
Package policykit-1-gnome which provides polkit-1-auth-agent is not configured yet.
Package gnome-shell which provides polkit-1-auth-agent is to be removed.
Removing gnome-shell (3.28.3-0ubuntu0.18.04.4) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Processing triggers for libreoffice-common (1:6.0.7-0ubuntu0.18.04.2) ...
Processing triggers for desktop-file-utils (0.23-1ubuntu3.18.04.2) ...
Processing triggers for libglib2.0-0:amd64 (2.56.3-0ubuntu0.18.04.1) ...
Processing triggers for cups (2.2.7-1ubuntu2.3) ...
Processing triggers for initramfs-tools (0.130ubuntu3.7) ...
update-initramfs: Generating /boot/initrd.img-4.15.0-46-generic
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Setting up policykit-1-gnome (0.105-6ubuntu2) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for shared-mime-info (1.9-2) ...
Processing triggers for dbus (1.12.2-1ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
Log ended: 2019-03-13 23:32:0
我现在可以看到一堆非常重要的包被删除了。sudo apt remove python从我的 bash 历史来看，我似乎sudo apt remove python3在构建新版本之前就调用了这两个版本。我改变了我原来的问题来反映这一点。
我按照建议通过重新安装 Ubuntu 解决了这个问题（谢谢！）。
当我第一次安装 Ubuntu 时，我完全遵循了Dual Boot Windows 10 和 Linux Ubuntu on separate Hard Drives [重复]的建议。
我仍然有 USB 安装介质，所以我从它启动，选择“其他”，然后我只需要进行三处更改（Ubuntu 安装在分区 /dev/sdd 上）：
所以总而言之，我只需要重做我用于初始安装的部分设置，并且我不必先创建分区表等。我确保不要在任何地方选择“格式化分区”选项，所以当安装完成，我所有的文件都还在。谢谢大家的帮助！