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如何合并CSV文件中的两个单元格像Excel一样

我想将csv文件文件中的两个单元格合并为

Header         Id        Name                       mobileNo
Sub-Header     id   first Name last Name     countryCode  MobNumber  

在我的系统（ubuntu 18.04）中运行 sudo apt-get update 命令时出现以下错误并且也无法安装任何新应用程序：-

$ sudo apt-get update
Hit:1 http://repo.mysql.com/apt/ubuntu bionic InRelease
Hit:2 http://linux.teamviewer.com/deb stable InRelease                         
Ign:3 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 InRelease      
Hit:4 http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 Release        
Get:5 http://sfo1.mirrors.digitalocean.com/mariadb/repo/10.2/debian jessie InRelease [3,263 B]
Ign:6 http://dl.google.com/linux/chrome/deb stable InRelease                   
Hit:7 https://repo.skype.com/deb stable InRelease                              
Hit:9 http://ppa.launchpad.net/flexiondotorg/hal-flash/ubuntu bionic InRelease 
Ign:11 http://extras.ubuntu.com/ubuntu trusty InRelease                        
Hit:12 http://security.ubuntu.com/ubuntu trusty-security InRelease             
Ign:13 http://archive.ubuntu.com/ubuntu artful InRelease                       
Ign:14 http://archive.canonical.com/ubuntu trusty InRelease                    
Err:5 http://sfo1.mirrors.digitalocean.com/mariadb/repo/10.2/debian jessie InRelease
  The following signatures were invalid: 199369E5404BD5FC7D2FE43BCBCB082A1BB943DB
Hit:15 http://dl.google.com/linux/chrome/deb stable Release                    
Hit:17 http://ppa.launchpad.net/linuxuprising/java/ubuntu bionic InRelease     
Get:18 http://extras.ubuntu.com/ubuntu …