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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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Ubuntu 22.04 -Virtual Box Notes

 Uninstall Virtual Box 6.1 From Ubuntu

sudo apt-get remove --purge virtualbox-6*
Then run auto-clean command.
--------------------------------------------
Reinstalling Virtual Box 7.0 in Ubuntu
sudo vim /etc/apt/sources.list
Add this to the file
deb [arch=amd64 signed-by=/usr/share/keyrings/oracle-virtualbox-2016.gpg] https://download.virtualbox.org/virtualbox/debian jammy contrib
Add signature using command
wget -O- https://www.virtualbox.org/download/oracle_vbox_2016.asc | sudo gpg --dearmor --yes --output /usr/share/keyrings/oracle-virtualbox-2016.gpg
Install Virtual box 7.0 latest version using command
sudo apt-get update
sudo apt-get install virtualbox-7.0
======================================
Download respective extension pack from link https://www.virtualbox.org/wiki/Downloads
Open VirtualBox->File->Tools->Extension Pack Manager
Remove Old extension pack  if there
Install->Browse current extension pack & Install

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If you have any doubts, please let me know.

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