我正在尝试在我的Ubuntu 16.04.5 LTS Linux计算机（xenial）上安装R。当我运行sudo apt-get upgrade时，尝试连接到login.mathworks.com时卡住了，我不知道为什么。
> sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded: gnome-software gnome-software-common libpam systemd libsmbclient libsystemd0 libudev1 libunity-control-center1 libwbclient0 python3-update-manager python3-urllib3 samba-libs systemd systemd-sysv ubuntu-software udev unity-control-center unity-control-center faces update-manager update-manager-core
19 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 14.8 MB of archives.
After this operation, 46.1 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
0% [Connecting to login.mathworks.com
(52.73.71.114)
我不知道为什么它试图连接到login.mathworks.com。我已经安装了MATLAB，但是我是使用MATLAB安装程序而不是apt-get来完成的。
我不知道这是我的机器，网络还是Mathworks的问题。关于如何解决此问题是否有任何想法？
谢谢。
大卫