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How to use gdb in Ubuntu Terminal

Here's a practical, minimal guide for using GDB in Ubuntu terminal — from launching to setting breakpoints and navigating your code. 🧰 Step 1: Compile with Debug Symbols Use -g and disable optimizations ( -O0 preferred for debugging): bash Copy Edit g++ -g -O0 -o myprog myprog.cpp 🚀 Step 2: Launch GDB bash Copy Edit gdb ./myprog You'll see a (gdb) prompt. 🎯 Step 3: Set Breakpoints You can set breakpoints in three main ways : ✅ a. At a function gdb Copy Edit (gdb) break main ✅ b. At a specific file and line gdb Copy Edit (gdb) break myprog.cpp:42 ✅ c. At a method in a class gdb Copy Edit (gdb) break MyClass::doSomething If the symbol is mangled (C++), GDB usually demangles automatically, especially if compiled with -g . ▶️ Step 4: Run the Program gdb Copy Edit (gdb) run 🧭 Step 5: Navigate Command Meaning next or n Step over current line step or s Step into function call finish Run until current function returns continue or c Continue until...
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Update Ubuntu 22.04 LTS to 24.04 LTS

 sudo apt update;sudo apt-get update;sudo apt upgrade;

sudo reboot;

sudo apt install ubuntu-release-upgrader-core

Temporarily Open port 1022 for tcp //check respective firewall settings based on ur Ubuntu image/PC

sudo do-release-upgrade -d

If error is coming do below

sudo nano /etc/update-manager/release-upgrades

Set prompt=normal

sudo do-release-upgrade

Then reply as per prompts & then sudo reboot;


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If you have any doubts, please let me know.

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