Can I run Linux without user and application permission restrictions?

Most regular applications can already access everything they need in your home directory. Problems usually happen when a program tries to write to system locations or access files owned by another user. Rather than removing permissions globally, identify the exact path or operation being denied and fix that specific issue.

Technically, you can run programs as the root user or grant them broad administrative access, but that is a very bad default setup. Root can modify or delete almost anything, so a mistake or compromised application could damage the entire system. Linux separates normal users from root specifically to prevent that. A better approach is to check the program's error messages and logs, then grant only the missing permission.

You could disable security features such as mandatory access controls and run everything as root, but that would make the operating system far easier to break or compromise. Removing doors and windows from a house might make moving furniture easier, but it also removes the security. Learning how users, groups, ownership, and logs work will make troubleshooting much more reliable.

Some applications, especially sandboxed packages, have additional restrictions beyond normal file permissions. If an application was installed as a sandboxed package, a permission-management tool can let you allow access to a particular folder or device. That is much safer than disabling the protections for every application.