خوب انجام دادم...
ali@ali-System-Product-Name:~$ sudo add-apt-repository ppa:yannubuntu/boot-repair
[sudo] password for ali:
Sorry, try again.
[sudo] password for ali:
You are about to add the following PPA to your system:
Simple tool to repair frequent boot problems.
Website: https://launchpad.net/boot-repair
More info: https://launchpad.net/~yannubuntu/+archive/boot-repair
Press [ENTER] to continue or ctrl-c to cancel adding it
gpg: keyring `/tmp/tmpybqxwl/secring.gpg' created
gpg: keyring `/tmp/tmpybqxwl/pubring.gpg' created
gpg: requesting key 60D8DA0B from hkp server keyserver.ubuntu.com
gpg: /tmp/tmpybqxwl/trustdb.gpg: trustdb created
gpg: key 60D8DA0B: public key "Launchpad PPA for YannUbuntu" imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
OK
ali@ali-System-Product-Name:~$
حالا چکار کنم؟