报错：E: Unable to locate package libprotobuf-dev
报错：hong@hong-virtual-machine:~$ sudo apt-get install libprotobuf-dev libleveldb-dev libsnappy-dev libopencv-dev libhdf5-serial-dev protobuf-compiler
Reading package lists… Done
Building dependency tree
Reading state information… Done
E: Unable to locate package libprotobuf-dev
E: Unable to locate package libleveldb-dev
E: Unable to locate package libsnappy-dev
E: Unable to locate package libopencv-dev
E: Unable to locate package libhdf5-serial-dev
E: Unable to locate package protobuf-compiler
Solution one:
Update
sudo apt update
Solution two:
Update
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
Solution three:
Check whether the ubuntu in your virtual machine is connected to the Internet
