Introduction

簡單記錄在 Kubuntu 上遇到藍牙可以搜尋到其他電腦，但無法搜尋到滑鼠鍵盤的問題。

Solution

首先先在檔案 /etc/bluetooth/main.conf 中搜尋 ControllerMode：

1

cat /etc/bluetooth/main.conf | grep ControllerMode

如果搜尋到但：

1. 值不是 dual：請設為 dual。
2. 值是 dual 但被註解：取消註解這行。

接著關閉藍牙後重新開啟，應該就可以搜尋到了。

References

• Ubuntu 20.04 cannot pair Bluetooth Keyboard

Introduction

本篇文章紀錄一下在 Kubuntu 下安裝 Line 的過程。

Introduction

繼 UPS CP1000AVRLCDa 微開箱 之後，電池過了五、六年開開始無法蓄電，原本不太確定是 UPS 電路的問題或電池的問題，但想了一下以 UPS 相對簡單的模組（電路板 + 電池 + 螢幕），通常會壞掉的應該是電池而不是電路板，因此決定嘗試看看先換電池看續電是否正常（如果換完一樣是壞的就算了）。

Create a Flask+uWSGI+Nginx Docker Image

In this example, we will create a Docker image for a Flask application using uWSGI and Nginx. The image will be based on the tiangolo/uwsgi-nginx-flask image, which is a popular choice for deploying Flask applications in production.

Create a Private Docker Registry and Push/Pull Docker Images

In this guide, you will:

1. Install Docker on an Ubuntu server
2. Set up a private Docker registry on the Ubuntu server
3. Create a Docker image on Windows and push it to the private registry
4. Pull the image on the Ubuntu server and run it

Create a ASP.NET Core Docker Image

This is a simple demo for creating a Docker image for an ASP.NET Core application.

Before starting, ensure you have the following requirements:

1. Install Docker.

2. Install the .NET SDK.

3. Prepare an ASP.NET Core application. You can create a new ASP.NET Core Web API project using the following command:

   1	$ dotnet new web -n Demo

Introduction

This guide outlines the steps to set up an OpenVPN server on Ubuntu 24.04, including certificate management, server configuration, firewall setup, and client provisioning.

Introduction

After enabling the OpenVPN server on an ASUS router, the exported client.ovpn file may trigger the following error in the OpenVPN client on Android:

1

OpenSSL: error:0A00018E:SSL routines:SSL_CTX_use_certificate:ca md too weak

This issue occurs because the CA certificate uses the SHA1 signature algorithm, which is outdated and considered insecure. Consequently, the OpenVPN client refuses to accept it.

There are two possible solutions:

1. Insecure (Not Recommended): Allow weak CA certificates.
2. Recommended: Renew the CA certificate using a stronger signature algorithm (e.g., SHA256 or higher).

Allowing weak certificates may expose your connection to man-in-the-middle (MITM) attacks or other vulnerabilities.

This guide walks you through the recommended solution.

Introduction

This guide shows you how to set up rsync on a Windows system by leveraging Git Bash from Git for Windows.
rsync is a powerful file synchronization tool commonly used on Linux, but it can also work on Windows with a few manual steps.
No need to install WSL or Cygwin - just follow this lightweight and portable method.

Introduction

This guide shows you through how to mount an external USB disk on an Ubuntu system and then access it from a Windows computer by mapping it as a network drive via SSH.
You don’t need to set up Samba or NFS — just SSH, which is often already available on Linux.