install yadedaily on Ubuntu 14.04

Hello,
I'm trying to install yadedaily on Ubuntu14.04, and I accorded to the following procedure
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sudo bash -c 'echo "deb http://www.yade-dem.org/packages/ trusty/" >> /etc/apt/sources.list'
wget -O - http://www.yade-dem.org/packages/yadedev_pub.gpg | sudo apt-key add -
sudo apt-get update
sudo apt-get install yadedaily

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After the I executed the second line command, I executed "upadte", and got messages
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Hit http://www.yade-dem.org trusty/ Packages
Ign http://www.yade-dem.org trusty/ Translation-en_US
Ign http://www.yade-dem.org trusty/ Translation-en
Reading package lists... Done
W: Duplicate sources.list entry http://www.yade-dem.org/packages/ trusty/ Packages (/var/lib/apt/lists/www.yade-dem.org_packages_trusty_Packages)
W: Duplicate sources.list entry http://www.yade-dem.org/packages/ trusty/ Packages (/var/lib/apt/lists/www.yade-dem.org_packages_trusty_Packages)
W: You may want to run apt-get update to correct these problems
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Then I continued the installation, and got the following message
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liu@liu-OptiPlex-7020:~$ sudo apt-get install yadedaily
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  kde-l10n-engb kde-l10n-zhcn libntdb1 python-ntdb
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  libyadedaily python-yadedaily
The following NEW packages will be installed:
  libyadedaily python-yadedaily yadedaily
0 upgraded, 3 newly installed, 0 to remove and 1 not upgraded.
Need to get 12.9 MB of archives.
After this operation, 89.2 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://www.yade-dem.org/packages/ trusty/ libyadedaily 2016.06a-19-baba476~trusty-1 [9,211 kB]
Get:2 http://www.yade-dem.org/packages/ trusty/ python-yadedaily 2016.06a-19-baba476~trusty-1 [2,100 kB]
Get:3 http://www.yade-dem.org/packages/ trusty/ yadedaily 2016.06a-19-baba476~trusty-1 [1,624 kB]
Fetched 12.9 MB in 36s (355 kB/s)
E: Failed to fetch http://www.yade-dem.org/packages/trusty/libyadedaily_2016.06a-19-baba476~trusty-1_amd64.deb Size mismatch

E: Failed to fetch http://www.yade-dem.org/packages/trusty/python-yadedaily_2016.06a-19-baba476~trusty-1_amd64.deb Size mismatch

E: Failed to fetch http://www.yade-dem.org/packages/trusty/yadedaily_2016.06a-19-baba476~trusty-1_amd64.deb Size mismatch

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Can you give me suggestions? Thank you.

Keqi