The key i to insert two double quotes at the current position is not working

Question

On Vim, I try to record a key sequence macro to surround a selected text in double-quotes.

First, I select a string of text and press key q followed by a register key to associate the macro, here I chose d.

The line recording @d appears in the footer line, indicating that the recording is on. Then I press the command x to remove (and automatically copy) the selected text.

Then where I have problem is when I press on the key i to insert two double quotes at the current position, it's not working.

I typed :verbose map i in normal mode but I got nothing.

I have Ubuntu installed on my raspberry Pi. I look in this file /etc/vim/vimrc to see if I can find why the i command is not working, I found nothing.

I have the Vi IMproved version 8.2.

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Any key sequence can be recorded as a macro for future execution. A macro can be recorded, for example, to surround a selected text in double-quotes. First, a string of text is selected and the key q is pressed, followed by a register key to associate the macro with, like d. The line recording @d will appear in the footer line, indicating that the recording is on. It is assumed that some text is already selected, so the first command is x to remove (and automatically copy) the selected text. The key i is pressed to insert two double quotes at the current position, then Esc returns to normal mode. The last command is P, to re-insert the deleted selection just before the last double-quote. Pressing q again will end the recording. Now, a macro consisting of key sequence x, i, "", Esc and P will execute every time keys @d are pressed in normal mode, where d is the register key associated with the macro.

Source: Learning materials LPI-1 (101)