The “nvidia-smi command not found” is caused by one major reason, which is that the nvidia-smi tool is not installed on the system.

The “umount target is busy” is fixed by forcefully unmounting, eliminating each process individually, or doing a lazy unmount to auto-remove processes.

The “passwd: authentication token manipulation error” is fixed by, cleaning the disk if it is full, granting shadow file permissions, or updating PAM.

Files are copied to a different directory using either the “cp” command or the “rsync” tool. Using these, single, multiple, as well as all files can be copied.

The “gpg: no valid OpenPGP data found” error occurs due to certification issues regarding the software that is to be installed using wget or curl.

The sed command can be used to search case-sensitive as well as case-insensitive strings and replace them with the desired string or pattern.

To extract a GZ file, use the “gzip” keyword with “-d” to decompress. Or use the “gunzip” keyword which does not require any extra option.

A “sh” file is run with the “bash” or “sh” command. To execute as a program the file should be made executable using the terminal or the GUI.

The “The following packages have been kept back” problem occurs when the dependencies have been updated but they require new packages alongside the old ones.

The “please install all available updates for your release before upgrading” problem occurs due to some files not being up to date on the current system.

The current version of Ubuntu can be checked using “hostnamectl” and “lsb_release” are often used. Various other commands are also described in this post.

To install a specific version of any apt package, you simply need to use the “madison” keyword to get a list of all versions and install any of your choices.

The “No space left on device” occurs due to corrupted blocks or deleted files taking up space. This is fixed by a daemon-reload or the e2fsck command.

The “add-apt-repository: command not found” problem occurs when the system does not have the “add-apt-repository” package installed on it.

The “docker no space left on device” error occurs when space runs out on the system. This is resolved by pruning the system or volumes, completely or manually.

The “no such file or directory” issue when the name or the path is entered incorrectly in the terminal or Ubuntu is unable to read the DOS script.

The “ng: command not found error” occurs if Angular CLI is missing, or its Path is not set. It’s fixed by installing, linking, or setting the path.

The “curl:(6) Could not resolve host” error occurs when the curl command is used with incorrect syntax or the DNS nameserver is missing.

The “zsh command not found” occurs when the zsh package is not installed, the command run on the z shell is invalid, or the package is not installed.

The “Yum command not found” error occurs if the yum package isn’t installed, its path isn’t specified, or the yum command is used on the wrong OS.

The “yarn command not found” error is invoked when the yarn tool is not installed on the system or its PATH environment variables are not set.

The “Vim can’t open file for writing” error occurs when the directory does not exist or the user is attempting to access root files.

The “npm command not found” issue arises when the npm tool is missing from the system or its environment path is not set correctly.

In Linux, a compressed file can be extracted using either GUI or CLI. With the GUI, simply click on the “Extract to” option and select the destination folder.

To delete a directory using GUI, you simply right-click on the directory and click on the Move to Trash option. The other method uses the “rm” command.

The “wget command not found” problem occurs when the wget package is not installed on it and is fixed by installing the wget package on the system.

The “Unable to locate package python-pip” error occurs due to a missing apt package. It can be fixed by using Universe Repository or the correct syntax.

The “pip command not found” problem occurs when the pip tool is not installed on the system or the incorrect syntax is being used.

Ubuntu Software Center, not loading problem is caused by corrupted files and can be fixed by reinstalling the software center or updating the application.

The “Bad Interpreter No Such File or Directory” error is fixed by converting the format. In Unix, this can be done using the vi, tr, or dos2unix package.

The “sudo command not found” error occurs when the system does not have sudo installed and can be fixed by using the root user to install sudo from apt.

Unable to insert the virtual optical disk” error occurs if a virtual disk is taking up the free slot on the VirtualBox system and can be fixed by removing it.

The “syntax error near unexpected token ‘newline'” error occurs when bash scripting syntax involves the bracket when they are used without quotations.

The main reasons that cause “editor does not contain a main type” are the missing main function and the build path is not correctly set.

To fix “undefined reference to pthread create” pthread header file must be included or you need to use the pthread syntax while compiling the program.

The “modulenotfounderror no module named mysql” occurs due to mysql to Python connector not being installed globally or due to conflicting variable names.

The “gcc no such file or directory” issue occurs when gcc is not installed. To install GCC, use “sudo apt install gcc” or “sudo apt install build-essential”.

The two main causes for the “Python.h: No such file or directory” error are missing the library and the compiler being unable to locate the library.

The “floating point exception (core dumped)” error can be caused by invalid mathematical operations, overflow, or underflow of data types.

The error “No module named ‘psycopg2” is caused by the absence of the psycopg2 package or some confusion caused in creating a variable or python file.

The “_tkinter.TclError: no display name and no $DISPLAY environment variable” error is fixed by adding the matplotlib or creating a display variable.

The error “undefined reference to ‘pow’” can occur due to the absence of the header file or due to incorrect compilation.

The “Youtube said: Unable to extract video data. Youtube-dl” error can occur due to corrupted or outdated files of the youtube_dl program.

The “fuse: bad mount point `/mnt’: Transport endpoint is not connected” error can occur during the process of mounting and unmounting of filesystems.

The “ZipImportError: can’t decompress data; zlib not available” error occurs because a dependency library “zlib” is not installed.