I have booted Linux Mint from USB stick. Everything works fine until I'm trying to install it. So I launch Install Linux Mint  choose my language ⇒ set up WiFi connection ⇒ Installation type shows up (already different from online tutorials).What do I see:If I click install now:  No root file system is defined. Please correct this from the partitioning menuif I click +: How to solve this issue?I'm using Acer s5 laptop.
Installing linux Mint 17.1 on Acer s5 No root file system defined
linux;linux mint;system installation
Is there a hard drive with more than 8GB? Any existing partitions (or a MBR/GPT) on it? Does it show up in sudo parted -l or sudo fdisk -l?Can you + / - / Change anything on that last screen? Or is there an earlier screen where you can pick a different option like Install alongside windows / Replace windows / Something else where you can pick a different option? Similar to this: Take a look at these related questions, you may need to create/format some ext partitions using gparted, or even a new MBR/GPT, or just pick some from the last installer window (the one in your image). Or possibly sudo apt-get remove dmraidNo root file system defined error while installing ubuntuHow do I install Ubuntu?And in case the above are no help whatsoever, the Mint installer runs ubiquity (an apparently customized version 2.18.8-1linuxmint8), ubiquity is a graphical installer for Ubuntu, written largely in Python, using debian-installer (d-i) as a backend for many of its functions.At least on XFCE it does, you can double-check yours by looking at the .desktop file that's probably on your desktop/in the ~/Desktop folder, or in the /usr/share/applications folder (running a find /usr -iname *install*.desktop -type fshould find /usr/share/applications/mintInstall.desktop too) then look at the file for the Exec=sh -c 'ubiquity gtk_ui' line to see exactly what it runs.ubiquity has a --debug option, so you can run this in a terminal to see more error messages too:ubiquity --debug gtk_uiHere's what the man page says about --debug-d, --debug       Run in debugging mode, sending verbose information to       /var/log/installer/debug that may be useful to developers.  (The       /var/log/syslog file is usually required in any case, along with       /var/log/partman in the case of problems related to partitioning.)       Note that passwords will be logged in debugging mode!