how to install latest version of nodejs in Ubuntu

You can try using Node Version Manager (NVM). You can find it on github here.

Briefly information to install nvm and node (see github repository for more information):

Install nvm:

wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | bash

Update Ubuntu environment variables. This commands let you run nvm from any place inside your terminal:
```
export NVM_DIR="$HOME/.nvm"

[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"
```
Check nvm is installed:
```
nvm --version
```
Install latest version of node (version selected by default):
```
nvm install node
```
Check node version:
```
node -v
```

Note: if you aren't be able to open node the first time, try to close and reopen your shell.

Remove the Previous one using:

sudo apt-get remove nodejs npm

Re install using PPA(Current Release):

sudo apt-get install python-software-properties
curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -

For LTS:

curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -

Facing the same issue not able to update from 5.12.0 to 6.x LTS version.But resolved it by following the instructions as mentioned in Nodejs.org

No need to remove the older version and all.

For upgrading to 6.x version: Run the below commands:

curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -
sudo apt-get install -y nodejs

For upgrading to 8.x version: Run the below commands:

curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
sudo apt-get install -y nodejs

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