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Windows 7 Update error (Code 8024402F) => install computer virus vaccine program (ex, McAfee, Avast, V3, AlYac, ...) McAfee : https://www.mcafee.com Avast : https://www.avast.com V3 : https://www.ahnlab.com AlYac(알약) : https://www.estsecurity.com

Windows 7 Update error (Code 80072EFE) => install KB3138612 https://www.catalog.update.microsoft.com/Search.aspx?q=KB3138612 Microsoft Update 카탈로그 www.catalog.update.microsoft.com ex) korean ex) english 참조 : https://answers.microsoft.com/en-us/windows/forum/windows_7-update/error-when-trying-to-update-windows/9ee89956-daf4-412a-9d09-f5a1ef0c131c

OpenJDK 8 / 11 install [ OpenJDK 11 install ] - Ubuntu $ sudo apt install openjdk-11-jdk - CentOS $ sudo yum install java-11-openjdk [ OpenJDK 8 install ] - Ubuntu $ sudo apt install openjdk-8-jdk - CentOS $ sudo yum install java-1.8.0-openjdk

App Inventor install / uninstall 1. debian package 1.1 install download file : appinventor2-setup_2.3_all.deb link http://appinv.us/aisetup_linux_deb and install 1.2 uninstall appinventor2-setup_2.3_all.deb file double click -> run Ubuntu Software -> remove click 2. use apt 2.1 install $ sudo apt install appinventor2-setup 2.2 uninstall $ sudo apt remove appinventor2-setup install directory /usr..

1. Add PPA $ sudo add-apt-repository ppa:alex-p/tesseract-ocr-devel 2. Install Tesseract $ sudo apt install tesseract-ocr References : https://launchpad.net/~alex-p/+archive/ubuntu/tesseract-ocr-devel tesseract-ocr - Tesseract command line OCR tool (devel) : Alexander Pozdnyakov This PPA contains an OCR engine - libtesseract and a command line program - tesseract. The development version availab..

Sublime Text Linux Package Manager Repositories https://www.sublimetext.com/docs/linux_repositories.html

Spring Initializr https://start.spring.io/

Spring websocket sample https://spring.io/guides/gs/messaging-stomp-websocket/

1. CentOS $ sudo yum install net-tools 2. Ubuntu $ sudo apt install net-tools

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