例如 安裝 pyqt5的時候出現：

(env_pytorch) [email protected]:~/anaconda2$ conda install -n env_pytorch pyqt5
Fetching package metadata ...........

PackageNotFoundError: Packages missing in current channels:
            
  - pyqt5

We have searched for the packages in the following channels:
            
  - https://repo.continuum.io/pkgs/main/linux-64
  - https://repo.continuum.io/pkgs/main/noarch
  - https://repo.continuum.io/pkgs/free/linux-64
  - https://repo.continuum.io/pkgs/free/noarch
  - https://repo.continuum.io/pkgs/r/linux-64
  - https://repo.continuum.io/pkgs/r/noarch
  - https://repo.continuum.io/pkgs/pro/linux-64
  - https://repo.continuum.io/pkgs/pro/noarch
 

這個時候，我們可以使用下面的指令來查詢我們想要安裝的包

anaconda search -t conda skimage 

(env_pytorch) [email protected]:~/anaconda2$ anaconda search -t conda pyqt5
Using Anaconda API: https://api.anaconda.org
Packages:
     Name                      |  Version | Package Types   | Platforms       | Builds    
     ------------------------- |   ------ | --------------- | --------------- | ----------
     abergeron/pyqt5           |    5.4.1 | conda           | osx-64          | py27_0    
     asmeurer/pyqt5            |    5.3.2 | conda           | osx-64          | py27_0, py33_0, py26_0, py34_0
     astrofrog/pyqt5           |    5.5.0 | conda           | linux-64        | py34_0, py35_0, py27_0
     avalentino/pyqt5          |    5.3.2 | conda           | linux-64, osx-64, win-64 | py27_0, py34_0
     bpentz/pyqt5              |      5.6 | conda           | win-64          | py35_0    
     dmazzella/pyqt5           |    5.3.1 | conda           | osx-64          | py34_0    
     dsdale24/pyqt5            |    5.3.2 | conda           | linux-64, osx-64, win-64 | py34_0, py27_0
     ebenolson/pyqt5           |    5.5.0 | conda           | linux-64        | 0, py34_0 
     ericdill/pyqt5            |    5.4.1 | conda           | linux-64        | py27_0    
     hadim/pyqt5               |    5.4.1 | conda           | linux-64        | py34_0    
     idaholab/pyqt5            |    5.6.0 | conda           | linux-64, osx-64 | py27_0    
     inso/pyqt5                |      5.6 | conda           | linux-64, win-32, win-64 | py35_0, py34_0
     ipa/pyqt5                 |    5.5.0 | conda           | linux-armv6l, win-64 | py27_0    
     jdreaver/pyqt5            |    5.4.1 | conda           | linux-64        | py34_0    
     m-labs/pyqt5              |    5.5.1 | conda           | linux-64, win-32, win-64 | py35_0    
     mmcauliffe/pyqt5          |    5.5.1 | conda           | linux-64, win-64, osx-64 | py27_0, py35_0, py34_0
     nicoddemus/pyqt5          |    5.4.1 | conda           | linux-64        | py34_0, py27_0
     nmearl/pyqt5              |    5.5.0 | conda           | linux-64, osx-64 | py35_0, py27_0
     tballance/pyqt5           |    5.4.1 | conda           | linux-armv7l    | py35_0    
Found 19 packages

Run 'anaconda show <USER/PACKAGE>' to get installation details
 

如上圖所示，這裡我們找到了多個可用的pyqt5包，如果是使用astrofrog/pyqt5

接著，我們使用show指令來檢視該包的詳細情況

(env_pytorch) [email protected]:~/anaconda2$ anaconda show astrofrog/pyqt5
Using Anaconda API: https://api.anaconda.org
Name:    pyqt5
Summary: 
Access:  public
Package Types:  conda
Versions:
   + 5.5.0

To install this package with conda run:
     conda install --channel https://conda.anaconda.org/astrofrog pyqt5
 

根據提示，我們使用下面的指令install這個包

onda install --channel https://conda.anaconda.org/astrofrog pyqt5

(env_pytorch) [email protected]:~/anaconda2$ conda install -n env_pytorch --channel https://conda.anaconda.org/astrofrog pyqt5
Fetching package metadata .............
Solving package specifications: .

Package plan for installation in environment /home/zxzhao/anaconda2/envs/env_pytorch:

The following NEW packages will be INSTALLED:

    pyqt5: 5.5.0-py27_0 astrofrog
    qt5:   5.5.0-0      astrofrog

Proceed ([y]/n)? y

qt5-5.5.0-0.ta 100% |##################################################################################| Time: 0:00:37 914.55 kB/s
pyqt5-5.5.0-py 100% |##################################################################################| Time: 0:00:09 562.82 kB/s

即可。

參考： https://blog.csdn.net/ksws0292756/article/details/79192268