مشکل نصب elementary tweaks؟

[OrchidDev]

درود دوستان من...
من از توزیع المنتری او اس استفاده می کنم که بخوام فضای دسکتاپ زیبا کنم و تم نصب کنم باید از ابزار elementary tweaks استفاده کنم ولی هنگام نصب ارورر میده چکار کنم؟
اینم ارور:

کد: [انتخاب]

Reading package lists... Done
Building dependency tree       
Reading state information... Done
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/restricted amd64 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_restricted_binary-amd64_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_main_binary-amd64_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/universe amd64 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_universe_binary-amd64_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/multiverse amd64 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_multiverse_binary-amd64_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/restricted i386 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_restricted_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/main i386 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_main_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/universe i386 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_universe_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com/ubuntu/ trusty-security/multiverse i386 Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_multiverse_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
E: Unable to locate package elementary-tweaks
ممنون میشم جواب بدید..
اینم لینک نصب نرم افزار : http://www.elementarynow.com/what-is-elementary-3/customize/

[alih_net]

خودش میگه!

You may want to run apt-get update to correct these problems

[دانیال بهزادی]

محتوای etc/apt/sources.list؟