Found a solution,open terminal and write sudo mv /usr/share/sounds/ubuntu/stereo/bell.ogg /usr/share/sounds/gnome/default/alerts this will move the file bell.ogg to the other directory, the write cd /usr/share/sounds/gnome/default/alerts , now, sudo mv bark.ogg bark1.ogg (this will change the name of the file bark.ogg), then write sudo mv bell.ogg bark.ogg (this will change the name of the file bell.ogg to bark.ogg) finally go to the sound setting into the setting menu and select Bark as the sound effect, but considering that we replaced bark with bell, bell sound will be played.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1753070 Title: Cannot restore default alert sound (Ubuntu bell) Status in gnome-control-center package in Ubuntu: Confirmed Bug description: After changing the default alert sound in Settings > Sound > Sound Effects, I cannot restore the alert sound to the Ubuntu 17.10 default. Gnome Control Center version: 1:3.26.2-0ubuntu0.2 There are five options in the Sound Effects tab: Default, Bark, Drip, Glass and Sonar. Selecting Default gives the same sound as Drip, which is not the default I had before. I think the sound options come from /usr/share/sounds/gnome/default/alerts where I found Ogg files for the Bark, Drip, Glass and Sonar options (but not for Default). The /usr/share/sounds/ubuntu/stereo/bell.ogg seems to have been the original default alert sound, to which I cannot restore. I am not sure if this is related, but when I opened the Sound Effects tab for the first time, the Alert Volume slider was at 0% and grayed out. The alert sound was working fine, so I guess that default settings from elsewhere were in effect until I started adjusting things in this tab and thereby overriding those default settings. I cannot restore to that grayed out state either in this tab. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: gnome-control-center 1:3.26.2-0ubuntu0.2 ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13 Uname: Linux 4.13.0-36-generic x86_64 ApportVersion: 2.20.7-0ubuntu3.7 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sat Mar 3 11:17:54 2018 InstallationDate: Installed on 2018-02-09 (21 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1) SourcePackage: gnome-control-center UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1753070/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

