我必须在 ubuntu 中安装 Review board，我尝试了以下命令，但出现错误
sudo apt-get install python-setuptools.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package python-setuptools is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package python-setuptools has no installation candidate
然后我尝试了下面的命令，但为此我也收到了错误消息：
apt-get upgrade
E: Could not open lock file /var/lib/dpkg/lock - open (13 Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), …