apt (Debian/Ubuntu) basics in Linux CLI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to update the package list on a Debian/Ubuntu system.

Linux CLI

sudo apt [1]

Drag options to blanks, or click blank then click option'

Aremove

Bupdate

Cinstall

Dupgrade

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'upgrade' instead of 'update' which upgrades packages instead of refreshing the list.

Using 'install' which installs new packages, not update the list.

The 'apt update' command refreshes the package list from repositories.

2fill in blank

medium

Complete the command to install the package named 'curl'.

Linux CLI

sudo apt [1] curl

Drag options to blanks, or click blank then click option'

Aremove

Bupdate

Cinstall

Dupgrade

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'remove' which deletes packages instead of installing.

Using 'update' which refreshes package lists but does not install.

The 'apt install' command installs new packages like 'curl'.

3fill in blank

hard

Fix the command to upgrade all installed packages to the newest version.

Linux CLI

sudo apt [1]

Drag options to blanks, or click blank then click option'

Aupgrade

Bupdate

Cinstall

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'update' which only refreshes package lists but does not upgrade packages.

Using 'install' which installs new packages, not upgrade existing ones.

The 'apt upgrade' command upgrades all installed packages to their latest versions.

4fill in blank

hard

Fill both blanks to remove the package 'nano' and clean up unused packages.

Linux CLI

sudo apt [1] nano && sudo apt [2]

Drag options to blanks, or click blank then click option'

Aremove

Bupdate

Cautoremove

Dinstall

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'install' instead of 'remove' to delete a package.

Using 'update' instead of 'autoremove' to clean unused packages.

First, 'apt remove nano' deletes the package. Then, 'apt autoremove' cleans unused dependencies.

5fill in blank

hard

Fill all three blanks to update package lists, upgrade packages, and clean cache.

Linux CLI

sudo apt [1] && sudo apt [2] && sudo apt [3]

Drag options to blanks, or click blank then click option'

Aupdate

Bupgrade

Cautoclean

Dautoremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'autoremove' instead of 'autoclean' to clean cache.

Skipping 'update' before 'upgrade' which can cause outdated upgrades.

The sequence updates lists, upgrades packages, then cleans old package files.

Practice

1. What does the apt update command do on a Debian/Ubuntu system?

easy

A. It upgrades all installed packages to the latest version.

B. It installs new software packages.

C. It removes installed software packages.

D. It refreshes the list of available packages and their versions.

Solution

1. Step 1: Understand the purpose of apt update

   This command downloads the latest package lists from the repositories configured on the system.

2. Step 2: Differentiate from other apt commands

   Unlike install or upgrade, it does not change installed software but only refreshes package info.

3. Final Answer:

   It refreshes the list of available packages and their versions. -> Option D

4. Quick Check:

   apt update refreshes package info [OK]

Hint: Remember: update refreshes info, install adds software [OK]

Common Mistakes:

• Confusing update with install or upgrade
• Thinking update removes packages
• Running update without sudo and expecting changes

2. Which of the following is the correct syntax to install the package named curl using apt?

easy

A. apt install curl

B. apt get install curl

C. apt install -y curl

D. apt-install curl

Solution

1. Step 1: Identify the correct apt install syntax

   The basic command is apt install package_name. Adding -y automatically confirms prompts.

2. Step 2: Evaluate each option

   apt install curl is correct syntax but misses automatic confirmation. apt get install curl is incorrect syntax; it should be apt-get not apt get. apt-install curl uses invalid syntax. apt install -y curl is correct and includes -y for automation.

3. Final Answer:

   apt install -y curl -> Option C

4. Quick Check:

   Use apt install -y for automatic yes [OK]

Hint: Use -y to skip prompts during install [OK]

Common Mistakes:

• Typing 'apt get' instead of 'apt-get'
• Using hyphens incorrectly in command names
• Forgetting sudo before apt commands

3. What will be the output of the command apt search nano if the package nano is available?

medium

A. Lists packages with 'nano' in their name or description.

B. Installs the nano package immediately.

C. Removes the nano package from the system.

D. Updates the nano package to the latest version.

Solution

1. Step 1: Understand the purpose of apt search

   This command searches the package database for names or descriptions matching the search term.

2. Step 2: Analyze the command effect

   It does not install, remove, or update packages; it only lists matching packages.

3. Final Answer:

   Lists packages with 'nano' in their name or description. -> Option A

4. Quick Check:

   apt search lists matching packages [OK]

Hint: Search shows matching packages, doesn't install or remove [OK]

Common Mistakes:

• Thinking search installs packages
• Confusing search with update or upgrade
• Expecting no output if package is not installed

4. You run apt install git but get a permission denied error. What is the most likely fix?

medium

A. Run the command with sudo as sudo apt install git.

B. Use apt update before installing git.

C. Remove git first using apt remove git.

D. Restart the computer and try again.

Solution

1. Step 1: Identify cause of permission denied

   Installing packages requires administrative rights, so running without sudo causes permission errors.

2. Step 2: Apply correct command with elevated rights

   Prepend sudo to gain necessary permissions: sudo apt install git.

3. Final Answer:

   Run the command with sudo as sudo apt install git. -> Option A

4. Quick Check:

   Use sudo for system changes [OK]

Hint: Use sudo for install/remove commands [OK]

Common Mistakes:

• Trying to install without sudo
• Running update instead of fixing permissions
• Restarting without fixing command permissions

5. You want to write a script that installs vim only if it is not already installed. Which command sequence correctly checks and installs using apt?

hard

A. apt search vim && sudo apt install vim

B. if ! dpkg -l | grep -q '^ii vim '; then sudo apt install -y vim; fi

C. sudo apt install vim && echo 'vim installed'

D. dpkg -s vim || apt install vim

Solution

1. Step 1: Understand how to check if vim is installed

   Using dpkg -l lists installed packages; filtering with grep '^ii vim ' checks if vim is installed.

2. Step 2: Use conditional to install only if not installed

   The if ! ...; then ...; fi structure runs install only if vim is missing.

3. Step 3: Evaluate other options

   sudo apt install vim && echo 'vim installed' installs unconditionally. apt search vim && sudo apt install vim searches but does not check installation. dpkg -s vim || apt install vim misses sudo and may fail silently.

4. Final Answer:

   if ! dpkg -l | grep -q '^ii vim '; then sudo apt install -y vim; fi -> Option B

5. Quick Check:

   Check with dpkg, install if missing [OK]

Hint: Use dpkg -l and grep to check before install [OK]

Common Mistakes:

• Installing without checking if package exists
• Forgetting sudo in install command
• Using apt search instead of dpkg for installed check