先にDockerをインストール
dockerインストール - MBP(はてな)
$ docker pull ubuntu:21.04
$ docker run -it -d --name ubuntu2104 ubuntu:21.04
docker DashboardのContainers / Apps の ubuntu2104 の CLIのボタンからcliを起動
# df -h
# uname -a (5.10.25-linuxkit)
# apt-get install vim
# vim (8.2.2434)
# apt-get install gcc
# gcc --version (10.3.0-1)
# apt-get install perl
# perl -v (5.32.1)
# apt-get install ruby
# ruby -v (2.7.2p137 (2020-10-01))
# apt-get install python
# python -v (2.7.18)
# apt-get install rustc
# rustc --version (1.50.0)
# apt-get install php
# php --version (7.4.16)
# apt-get install golang
# go version (1.16.2)
# apt-get install git
# git --version (2.30.2)
# apt-get install lua
# apt-get install lua5.4
# lua -v (5.4.2)
# apt-get install xfce4
Ubuntuとその派生物にXfceをインストールする方法は? | Ubunlog
# apt-get install lightdm
# apt-get install synaptic
# df -h
Size 59G, Used 7.1G, Avail 49G, Use 13%
Opevcv
# python3 grayscale.pyでエラー
Traceback (most recent call last):
File "/root/grayscale.py", line 4, in
img_gray = cv2.cvtColor(img_bgr, cv2.COLOR_BGR2GRAY)
cv2.error: OpenCV(4.5.2) /tmp/pip-req-build-qm9qliph/opencv/modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'
Python 3.9.5, OpenCv 4.5.2
>>> cv2.__version__ (4.5.2)