ubuntu-20.04

问题 Installed Android 4.1 on Ubuntu 20.04. Getting the following error: Gradle sync failed: com.android.tools.idea.gradle.project.sync.idea.issues.SdkPlatformNotFoundException: Module: 'app' platform 'android-29' not found. On opening the SDK manager I get the following screen: I also executed $ANDROID_HOME/cmdline-tools/tools/bin/sdkmanager --licenses How to fix this? ------ edit --------- This is what shows in the SDK Platforms tab. Unchecking the "Hide Obsolete Packages" doesn't change

来源： https://stackoverflow.com/questions/62405765/memory-allocation-to-docker-containers-after-moving-to-wsl-2-in-windows

来源： https://stackoverflow.com/questions/64120030/hash-sum-mismatch-when-apt-get-update-ubuntu-20-04-vm-with-multipass

来源： https://stackoverflow.com/questions/64120030/hash-sum-mismatch-when-apt-get-update-ubuntu-20-04-vm-with-multipass

来源： https://stackoverflow.com/questions/64120030/hash-sum-mismatch-when-apt-get-update-ubuntu-20-04-vm-with-multipass

来源： https://stackoverflow.com/questions/62357205/openssl-cant-establish-ssl-connection-because-unsupported-protocol

来源： https://stackoverflow.com/questions/62331237/problem-to-install-pygame-on-ubuntu-20-04lts

来源： https://stackoverflow.com/questions/62331237/problem-to-install-pygame-on-ubuntu-20-04lts

问题 I've recently (re-)installed OpenCV 4.0.0 on Ubuntu 20.04, but when I try to build some c++ code on Sublime Text, it gives me back errors. This is the code: #include <stdio.h> #include <stdlib.h> #include "opencv2/opencv.hpp" #include "opencv2/highgui/highgui.hpp" using namespace cv; using namespace std; int radius = 50; int curve_angle = 10; int main() { Mat img(radius, radius, CV_8UC3, Scalar(0,0, 100)); namedWindow("showWindow", WINDOW_AUTOSIZE); imshow("showWindow", img); waitKey(0);

问题 I am trying to install mininet-wifi. After downloading it, I have been using the following command to install it: sudo util/install.sh -Wlnfv However, I keep getting the error: E: Unable to locate package python-pip I have tried multiple times to download python-pip. I know mininet-wifi utilizes python 2 instead of python 3. I have tried to download python-pip using the command: sudo apt-get install python-pip But that leads to the same error: E: Unable to locate package python-pip 回答1: Since