我最初安装了 protobuf 3.13.0，然后使用 apt remove 将其删除，但它并没有被删除。
我甚至按照这些说明从源代码安装了 protobuf 3.6.1，但仍然使用 3.13.0 https://askubuntu.com/a/1072684/165324
$ protoc --version
libprotoc 3.13.0
$ sudo apt-get install protobuf-compiler libprotobuf-dev
$ sudo apt remove protobuf-compiler libprotobuf-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'libprotobuf-dev' is not installed, so not removed
Package 'protobuf-compiler' is not installed, so not removed
The following packages were automatically installed and are no longer required:
libprotobuf-lite17 libprotoc17 linux-image-5.4.0-58-generic linux-modules-5.4.0-58-generic
linux-modules-extra-5.4.0-58-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 27 not upgraded.
$ sudo apt-get install protobuf-compiler libprotobuf-dev
$ sudo apt remove protobuf-compiler libprotobuf-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'libprotobuf-dev' is not installed, so not removed
Package 'protobuf-compiler' is not installed, so not removed
The following packages were automatically installed and are no longer required:
libprotobuf-lite17 libprotoc17 linux-image-5.4.0-58-generic linux-modules-5.4.0-58-generic
linux-modules-extra-5.4.0-58-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 27 not upgraded.
使用以下方式安装 3.6.1：
$ wget https://github.com/protocolbuffers/protobuf/releases/download/v3.6.1/protobuf-all-3.6.1.tar.gz
$ tar -xvzf protobuf-all-3.6.1.tar.gz
$ cd protobuf-3.6.1/
$ ./configure
$ make
$ make check
$ sudo make install
$ sudo ldconfig
答案1
我注意到我有：
$ which -a protoc
/home/mona/anaconda3/bin/protoc
/usr/local/bin/protoc
我在 ~/.bashrc 中添加了最后一行：
$ tail ~/.bashrc
alias vi='vim'
aa_prompt_defaults
alias bat='batcat'
alias fd='fdfind'
alias protoc=/usr/local/bin/protoc
然后：
$ source ~/.bashrc
现在：
$ protoc --version
libprotoc 3.6.1