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User is not in the sudoers file (ubuntu)

Ketika saya menggunakan user yang bukan user default, saya mau melakukan sudo untuk mengedit sebuah file konfigurasi. Akan tetapi, muncul peringatan "user is not in the sudoers file". Saya coba untuk melihat group dari user yang sedang saya gunakan, saya kemudian coba ubah menjadi root. Setelah saya logout dan balik lagi, ternyata pesan itu muncul lagi.

Setelah saya otak-ati lagi, ternyata user yang boleh melakukan sudo bukan user yang ada dalam group root, tapi admin.

Kalau anda menghadapi masalah serupa, lakukan langkah-langkah sebagai berikut:
- system --> administration --> users and groups
- unlock, masukkan password
- dalam tab 'advance', ubah group user anda menjadi group admin
- logout
- login lagi
- coba buka terminal. kalau sudah ada keterangan di atas, "to run a command as administrator.....", maka itu berarti anda sudah bisa melakukan sudo.

Selamat mencoba.
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