Put char with sed

put char on position X with sed
 
put space on position 5
echo 1234567 | sed 's/./& /5'

put . on position 5
echo 1234567 | sed 's/./&./5'
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Apt error Could not get lock /var/lib/apt/lists/lock

  sudo fuser -vik -TERM /var/lib/apt/lists/lock  

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