Linux Common commands,errors and their : Solutions

Section 1: Package Management Errors

1. Error: E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

   Solution: sudo rm /var/lib/dpkg/lock and then sudo dpkg --configure -a

2. Error: E: Package 'package-name' has no installation candidate

   Solution: sudo apt update and then sudo apt install package-name

Section 2: Networking Errors

1. Error: Failed to connect to wifi network

   Solution: sudo service network-manager restart or sudo systemctl restart NetworkManager

2. Error: No network interfaces found

   Solution: sudo ip link set eth0 up (replace eth0 with your network interface)

3. Error: DNS re: Solution failed

   Solution: sudo service bind9 restart or sudo systemctl restart systemd-resolved

Section 3: File System Errors

1. Error: Disk full, cannot write - clean up unneeded files

   Solution: sudo apt autoremove and sudo apt clean to free up disk space

2. Error: File system corrupted

   Solution: sudo fsck -y /dev/sda1 (replace /dev/sda1 with the affected partition)

3. Error: Permission denied

   Solution: sudo chmod 755 /path/to/file to change file permissions

Section 4: Boot Errors

1. Error: Failed to boot, kernel panic

   Solution: sudo update-initramfs -u and then sudo update-grub

2. Error: GRUB error, unknown filesystem`

   Solution: sudo grub-install /dev/sda (replace /dev/sda with the boot disk)

3. Error: Failed to load kernel modules

   Solution: sudo depmod and then sudo update-initramfs -u

4. Error: Boot loader not found

   Solution: sudo update-grub and then sudo grub-install /dev/sda

5. Error: gave up waiting for suspend/resume device

   Solution: add correct swap partition uuid in /etc/initramfs-tools/conf.d/resume, run sudo update-initramfs -u and reboot

Section 5: User Account Errors

1. Error: Login failed, incorrect password

   Solution: sudo passwd username to reset the password

2. Error: User account locked

   Solution: sudo usermod -U username to unlock the account

3. Error: Failed to create new user account

   Solution: sudo useradd -m username to create a new user account

Section 6: Graphics Errors

1. Error: Failed to start X server

   Solution: sudo service lightdm restart or sudo systemctl restart gdm

2. Error: Graphics driver not found

   Solution: sudo apt install nvidia-driver (or the relevant graphics driver)

3. Error: Screen re: Solution not detected

   Solution: sudo xrandr --auto to auto-detect screen re: Solution

Section 7: System Errors

1. Error: System crash, kernel oops

   Solution: sudo apt install linux-crashdump and then sudo reboot

2. Error: Failed to start system service

   Solution: sudo systemctl start service-name (replace service-name with the affected service)