$ sudo apt-get install -y libxml2-utils 186Reading package lists... Done 187Building dependency tree 188Reading state information... Done 189The following NEW packages will be installed: 190 libxml2-utils 1910 upgraded, 1 newly installed, 0 to remove and 256 not upgraded. 192Need to get 35.0 kB of archives. 193After this operation, 181 kB of additional disk space will be used. 194Err:1 http://security.ubuntu.com/ubuntu xenial-security/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 195 Connection failed 196Err:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 197 Connection failed 198Err:1 http://security.ubuntu.com/ubuntu xenial-security/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 199 Connection failed 200Err:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 201 Connection failed 202Err:1 http://security.ubuntu.com/ubuntu xenial-security/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 203 Connection failed 204Err:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 205 Connection failed 206Err:1 http://security.ubuntu.com/ubuntu xenial-security/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 207 Connection failed 208Err:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 209 Connection failed 210Err:1 http://security.ubuntu.com/ubuntu xenial-security/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 211 Connection failed 212Err:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 213 Connection failed 214Err:1 http://security.ubuntu.com/ubuntu xenial-security/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 215 Connection failed 216Err:1 http://security.ubuntu.com/ubuntu xenial-security/main amd64 libxml2-utils amd64 2.9.3+dfsg1-1ubuntu0.6 217 Connection failed 218E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/libx/libxml2/libxml2-utils_2.9.3+dfsg1-1ubuntu0.6_amd64.deb Connection failed 219 220E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? 221The command "sudo apt-get install -y libxml2-utils" failed and exited with 100 during . 222 223Your build has been stopped. Top