Cannot install Wireshark on Ubuntu 18.04

$   sudo apt update  $   sudo apt upgrade  $   sudo apt install wireshark 

Ends up in:

E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/w/wireshark/libwireshark-data_2.6.4-2~ubuntu18.04.0_all.deb  404  Not Found [IP: 193.166.3.5 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/w/wireshark/libwsutil9_2.6.4-2~ubuntu18.04.0_amd64.deb  404  Not Found [IP: 193.166.3.5 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/w/wireshark/libwiretap8_2.6.4-2~ubuntu18.04.0_amd64.deb  404  Not Found [IP: 193.166.3.5 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/w/wireshark/libwscodecs2_2.6.4-2~ubuntu18.04.0_amd64.deb  404  Not Found [IP: 193.166.3.5 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/w/wireshark/libwireshark11_2.6.4-2~ubuntu18.04.0_amd64.deb  404  Not Found [IP: 193.166.3.5 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/w/wireshark/wireshark-common_2.6.4-2~ubuntu18.04.0_amd64.deb  404  Not Found [IP: 193.166.3.5 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/w/wireshark/wireshark-qt_2.6.4-2~ubuntu18.04.0_amd64.deb  404  Not Found [IP: 193.166.3.5 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/universe/w/wireshark/wireshark_2.6.4-2~ubuntu18.04.0_amd64.deb  404  Not Found [IP: 193.166.3.5 80] E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? 

What seems to be the problem?