پاسخ : اشکال در آپدیت سورس لیست المنتری لینوکس

سلام و عرض ادب

دوستان  من لینوکس المنتری رو نصب کردم  و با یک مشکل مواجه هستم 
وقتی  دستور :
sudo apt-get update

در آخر  با این خطا مواجه میشم :

W: The repository 'http://packages.elementary.io/appcenter loki Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://ppa.launchpad.net/elementary-os/stable/ubuntu loki Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://ppa.launchpad.net/elementary-os/os-patches/ubuntu loki Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://ppa.launchpad.net/versable/elementary-update/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://packages.elementary.io/appcenter/dists/loki/main/binary-amd64/Packages  404  Not Found [IP: 104.28.4.44 80]
E: Failed to fetch http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/loki/main/source/Sources  404  Not Found
E: Failed to fetch http://ppa.launchpad.net/elementary-os/os-patches/ubuntu/dists/loki/main/source/Sources  404  Not Found
E: Failed to fetch http://ppa.launchpad.net/versable/elementary-update/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
من حتی   سورس لیت رو عوض کردم یه سورس لیست جدید ساختم ولی باز این خطا هست

و حتی وقتی آپدیت منیجر رو هم نصب کردم که با اون پک ها رو آپدیت کنم باز خطا میده
به راحتی میتونم هر نرم افزاری رو نصب کنم ولی تو آدیت خطا مواجه میشم  لطفا کمک کنید