You might want to experiment with asking AI such as CHATGPT for help.
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Quote:
How to Fix the Permission Warning
This happens because Bazzite uses an immutable (read-only) file system where /usr/bin cannot be modified directly. Calibre installs successfully to /var/opt/calibre, but it cannot create the shortcut commands.
To fix this, you need to manually link Calibre to your user's local directory (~/.local/bin), which is writeable and already in your system's PATH.
Step-by-Step Fix
Run these two commands in your terminal to create the required launch symlinks:
Create the local bin folder (in case it does not exist yet)
:bash
mkdir -p ~/.local/bin
Create the Calibre symlinks inside your user directory
:bash
ln -s /var/opt/calibre/calibre ~/.local/bin/calibre && ln -s /var/opt/calibre/calibre-server ~/.local/bin/calibre-server
Launching Calibre
You can now start the application by simply typing calibre in your terminal.It should also automatically appear in your desktop application menu after a system restart.
How to Fix the Immutable File System ErrorsThese warnings happen because Bazzite's core system (/usr) is entirely read-only. Calibre is fully installed, but its installer cannot place the command-line auto-complete file or the desktop app icon into the root system folders.You can easily bypass this by forcing the installer to place these files inside your writeable home directory (~/.local) instead.
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I would suggest asking your self. I'd started by asking about installing calibre on Bazzite and then supplying the error messages you supplied