當我嘗試在ubuntu20.04上運行GAMIT下的doy命令時，顯示：
root@DESKTOP-LF0EAC9:/etc/apt# doy
doy: error while loading shared libraries: libgfortran.so.3: cannot open shared object file: No such file or directory
其中libgfortran.so.3依賴于gfortran-6，則嘗試安裝gfortran-6：
root@DESKTOP:/etc/apt# apt install gfortran-6
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package gfortran-6
這里的問題是ubuntu20.04不支持g+±6，添加以下源至/etc/apt/sources.list，添加源方式見鏈接
deb http://gb.archive.ubuntu.com/ubuntu/ bionic main universe
運行
sudo apt-get update
安裝gcc++ -6
apt-get install g++-6
設定gcc默認版本
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 6
安裝gfortran-6
apt install gfortran-6
安裝成功，運行doy
root@DESKTOP-LF0EAC9:/etc/apt# doy 2020 001
Date 2020/01/01 0:00 hrs, DOY 1 JD 2458849.5000 MJD 58849.0000
GPS Week 2086 Day of week 3, GPS Seconds 259200 Day of Week Wed
Decimal Year 2020.000000000 GRACE Seconds 631108800.0
運行成功
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