این جواب دستور اول
hamid@hamid-ThinkPad:~$ sudo apt update
[sudo] password for hamid:
Ign cdrom://Ubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021) wily InRelease
Ign cdrom://Ubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021) wily/main Translation-en_US
Ign cdrom://Ubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021) wily/main Translation-en
Ign cdrom://Ubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021) wily/restricted Translation-en_US
Ign cdrom://Ubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021) wily/restricted Translation-en
Hit http://archive.ubuntu.com wily InRelease
Get:1 http://archive.ubuntu.com wily-updates InRelease [65.9 kB]
Get:2 http://dl.google.com stable InRelease [1,540 B]
21% [2 InRelease gpgv 1,540 B] [1 InRelease 12.8 kB/65.9 kB 19%]Splitting up /var/lib/apt/lists/partial/dl.google.com_linux_chrome_deb_dists_stable_InRelease inIgn http://dl.google.com stable InRelease
E: GPG error: http://dl.google.com stable InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)
و این هم برای دومی
hamid@hamid-ThinkPad:~$ cat /etc/apt/sources.list
deb cdrom:[Ubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021)]/ wily main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu wily main restricted
deb-src http://archive.ubuntu.com/ubuntu wily main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu wily-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu wily-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 http://archive.ubuntu.com/ubuntu wily universe
deb-src http://archive.ubuntu.com/ubuntu wily universe
deb http://archive.ubuntu.com/ubuntu wily-updates universe
deb-src http://archive.ubuntu.com/ubuntu wily-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 http://archive.ubuntu.com/ubuntu wily multiverse
deb-src http://archive.ubuntu.com/ubuntu wily multiverse
deb http://archive.ubuntu.com/ubuntu wily-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu wily-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 http://archive.ubuntu.com/ubuntu wily-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu wily-backports main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu wily-security main restricted
deb-src http://archive.ubuntu.com/ubuntu wily-security main restricted
deb http://archive.ubuntu.com/ubuntu wily-security universe
deb-src http://archive.ubuntu.com/ubuntu wily-security universe
deb http://archive.ubuntu.com/ubuntu wily-security multiverse
deb-src http://archive.ubuntu.com/ubuntu wily-security multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu wily partner
# deb-src http://archive.canonical.com/ubuntu wily partner
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