# When crontab gives fopen: permission denied error

While trying to open my user's crontab on Ubuntu, the system barked back:

```bash
$ crontab -l
crontabs/myuser/: fopen: Permission denied
```
This is due to improper permissions on crontab executable.

To fix:

```bash
$ sudo chown root:crontab /usr/bin/crontab
$ sudo chmod 2755 /usr/bin/crontab
```

Mucked up perms:
```bash
rwxr-xr-x 1 root root 39352 Nov 16  2017 /usr/bin/crontab
```

After fix:
```bash
-rwxr-sr-x 1 root crontab 39352 Nov 16  2017 /usr/bin/crontab
```

Solution from [Ask Ubuntu: cannot access crontab after changing uid](https://askubuntu.com/questions/710671/cannot-access-crontab-after-changing-uid).