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nabbisen
nabbisen

Posted on • Edited on • Originally published at scqr.net

Fix Flutter doctor failed due to permission denied on Linux

#flutter #archlinux #mobile #troublushooting

Problem

When I tried to install Flutter 2 on Linux, running flutter doctor was required.

Running it, however, resulted in the "Permission denied" error below.

$ flutter doctor
touch: cannot touch '/opt/flutter/bin/cache/.dartignore': Permission denied
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Should I do it as root, superuser? No. It is not recommended:

$ sudo flutter doctor
   Woah! You appear to be trying to run flutter as root.
   We strongly recommend running the flutter tool without superuser privileges.
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Solution

Invite the user you use to "flutterusers" group.
Here is an Arch Linux example. Run this command:

$ sudo usermod -a -G flutterusers <your-user>
$ # alternatively:
$ #sudo gpasswd -a <your-user> flutterusers
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Log out and login again.
Then, try flutter doctor again.

$ flutter doctor
   Building flutter tool...
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Solved 🙂

Optional: Another way (less recommended)

Alternatively, it may be solved by changing /opt/flutter permission. But it is perhaps less recommended.

$ sudo chown -R <your-user>: /opt/flutter
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