我刚刚通过 deadsnakes ppa 在我的 18.04LTS 上安装了 python3.7：
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install python3.7 -y
现在我想创建一个虚拟环境，python3.7 -m venv env但我得到
Error: Command '['/path/to/desired/env/bin/python3.7', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1.
python3 -m venv env0 以前工作得很好。
为什么会发生这种情况？
如何在 Ubuntu 18.04LTS 上为 python3.7 创建虚拟环境？
我想在我的 ubuntu 机器上安装 ubuntu 作为虚拟机。主机系统的版本是：Ubuntu 18.04.4 LTS
我要安装的iso是：ubuntu-18.04.4-desktop-amd64.iso
所以我下载了vmplayer 并运行：
sudo bash VMware-Player-15.5.1-15018445.x86_64.bundle
当我vmplayer在终端中运行时，我得到
[AppLoader] Use shipped Linux kernel AIO access library.
An up-to-date "libaio" or "libaio1" package from your system is preferred.
[AppLoader] Use shipped Linux kernel AIO access library.
An up-to-date "libaio" or "libaio1" package from your system is preferred.
I/O warning : failed to load external entity "/etc/vmware/hostd/proxy.xml"
(vmplayer:19995): Gtk-WARNING **: 19:11:09.896: Inserting action group 'Base' into UI manager which already has a …我想执行一个以
library(dplyr)
library(lubridate)
library(ggplot2)
我开始使用常规r-base-core并r-cran-lubridate安装。我有：
Error in mutate_impl(.data, dots) :
Evaluation error: `as_dictionary()` is defunct as of rlang 0.3.0.
Please use `as_data_pronoun()` instead.
（代码本身并没有使用mutate_impl它似乎是这个问题https://github.com/r-lib/rlang/issues/674，建议更新dplyr
r 版本R version 3.4.4 (2018-03-15)适用于 dplyr 我不知道如何找到。
所以我按照别处的描述更改了源代码：添加deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/到/etc/apt/sources.list
sudo apt-get update
sudo apt-get install r-base
sudo apt-get install r-cran-dplyr
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that …