First I've installed curl:

company@rb-VirtualBox:~$ apt install curl
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?

company@rb-VirtualBox:~$ sudo apt install curl
[sudo] password for company: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
curl is already the newest version (7.68.0-1ubuntu2.7).
0 upgraded, 0 newly installed, 0 to remove and 552 not upgraded.

Then I tried to use it:

company@rb-VirtualBox:~$ ​curl -X GET 'http://localhost:9200'

Command '​curl' not found, did you mean:

  command 'curl' from deb curl (7.68.0-1ubuntu2.7)

Try: apt install <deb name>

As you can see it still says "Command '​curl' not found".

If I execute it with the full path like this:

company@rb-VirtualBox:~$ /usr/bin/curl -X GET 'http://localhost:9200'

then it works

More Informations:

company@rb-VirtualBox:~$ whereis curl
curl: /usr/bin/curl /usr/share/man/man1/curl.1.gz

company@rb-VirtualBox:~$ echo $PATH
  • what if you try ​command curl -X GET 'http://localhost:9200' or \​curl -X GET 'http://localhost:9200'?
    – jesse_b
    Commented Apr 5, 2022 at 13:57
  • For the first I get command: command not found, the second one throws the error Command '​curl' not found
    – Black
    Commented Apr 5, 2022 at 13:58
  • What does type -a curl produce?
    – jesse_b
    Commented Apr 5, 2022 at 13:59
  • curl is /usr/bin/curl
    – Black
    Commented Apr 5, 2022 at 14:00
  • 2
    strange. I wonder if maybe there was some sort of special character involved when you first had the issue. If you copied that full command from somewhere maybe it had a \r or something in it.
    – jesse_b
    Commented Apr 5, 2022 at 14:03

1 Answer 1


I don't know why, but after calling it with

company@rb-VirtualBox:~$ /usr/bin/curl -X GET 'http://localhost:9200'

now suddenly this works too:

company@rb-VirtualBox:~$ curl -X GET 'http://localhost:9200'


As @jesse_b assumed correctly in the comments, it is because I copied the command from a website and some fishy characters like \r or \n where included, which were causing the error.

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