如果我使用 sudo apt install 安装任何软件包，都会遇到错误。错误与软件包无关。我正在使用 sudo su（root）用户进行安装。请指教。操作系统版本：Ubuntu 18.04
命令：
sudo apt install consul
错误详情：
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
consul
0 upgraded, 1 newly installed, 0 to remove and 241 not upgraded.
1 not fully installed or removed.
Need to get 0 B/55.0 MB of archives.
After this operation, 143 MB of additional disk space will be used.
dpkg (subprocess): unable to execute package control information extraction (dpkg-deb): Permission denied
dpkg: error processing archive /var/cache/apt/archives/consul_1.15.3-1_amd64.deb (--unpack):
dpkg-deb --control subprocess returned error exit status 2
Errors were encountered while processing:
/var/cache/apt/archives/consul_1.15.3-1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)