Previously I deleted my sources.list file. My Zorin OS version is 15.3, If anyone using this version of Zorin please provide me the sources.list file. Thanks
GNU nano 2.9.3 /etc/apt/sources.list
#deb cdrom:[Zorin-OS 15.3 Lite 64bit]/ bionic main restricted
#See UpgradeNotes - Community Help Wiki for how to upgrade to
#newer versions of the distribution.
deb Index of /ubuntu bionic main restricted
#deb-src Index of /ubuntu/ bionic main restricted
##Major bug fix updates produced after the final release of the
##distribution.
deb Index of /ubuntu bionic-updates main restricted
#deb-src Index of /ubuntu/ bionic-updates main restricted
##N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
##team. Also, please note that software in universe WILL NOT receive any
#review or updates from the Ubuntu security team.
deb Index of /ubuntu bionic universe
#deb-src Index of /ubuntu/ bionic universe
deb Index of /ubuntu bionic-updates universe
#deb-src Index of /ubuntu/ bionic-updates universe
##N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
##team, and may not be under a free licence. Please satisfy yourself as to
##your rights to use the software. Also, please note that software in
##multiverse WILL NOT receive any review or updates from the Ubuntu
#security team.
deb Index of /ubuntu bionic multiverse
#deb-src Index of /ubuntu/ bionic multiverse
deb Index of /ubuntu bionic-updates multiverse
#deb-src Index of /ubuntu/ bionic-updates multiverse
##N.B. software from this repository may not have been tested as
##extensively as that contained in the main release, although it includes
##newer versions of some applications which may provide useful features.
##Also, please note that software in backports WILL NOT receive any review
##or updates from the Ubuntu security team.
deb Index of /ubuntu bionic-backports main restricted universe
#deb-src Index of /ubuntu/ bionic-backports main restricted$
##Uncomment the following two lines to add software from Canonical's
hope i did it right