Partition OS drive for another OS?

[pSBAy5nsWsWrE4B6]

Hi guys,

I'm looking at partitioning my drive to dual boot another OS.

System:    Host: cube Kernel: 4.20.1-1-MANJARO x86_64 bits: 64 compiler: gcc v: 8.2.1 Desktop: KDE Plasma 5.14.5 
           Distro: Manjaro Linux 
Machine:   Type: Desktop Mobo: GIGABYTE model: MRHM3AP serial: <filter> UEFI: American Megatrends v: F6 
           date: 08/07/2013 
CPU:       Topology: Dual Core model: Intel Core i3-3227U bits: 64 type: MT MCP arch: Ivy Bridge rev: 9 
           L2 cache: 3072 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 15169 
           Speed: 842 MHz min/max: 800/1900 MHz Core speeds (MHz): 1: 798 2: 798 3: 798 4: 798 
Graphics:  Device-1: Intel 3rd Gen Core processor Graphics vendor: Gigabyte driver: i915 v: kernel 
           bus ID: 00:02.0 
           Display: x11 server: X.Org 1.20.3 driver: intel unloaded: modesetting resolution: 2560x1440~60Hz 
           OpenGL: renderer: Mesa DRI Intel Ivybridge Mobile v: 4.2 Mesa 18.3.1 direct render: Yes 
Audio:     Device-1: Intel 7 Series/C216 Family High Definition Audio vendor: Gigabyte driver: snd_hda_intel 
           v: kernel bus ID: 00:1b.0 
           Device-2: Micronas type: USB driver: hid-generic,snd-usb-audio,usbhid bus ID: 2-1.3:6 
           Sound Server: ALSA v: k4.20.1-1-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Gigabyte driver: r8168 
           v: 8.045.08-NAPI port: e000 bus ID: 02:00.0 
           IF: enp2s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           Device-2: Realtek RTL8188CE 802.11b/g/n WiFi Adapter 
           vendor: AzureWave AW-NE139H Half-size Mini PCIe Card driver: rtl8192ce v: kernel port: d000 
           bus ID: 03:00.0 
           IF: wlp3s0 state: down mac: <filter> 
Drives:    Local Storage: total: 238.48 GiB used: 148.61 GiB (62.3%) 
           ID-1: /dev/sda vendor: Crucial model: CT240M500SSD3 size: 223.57 GiB 
           ID-2: /dev/sdb type: USB model: USB DISK 2.0 size: 14.91 GiB 
Partition: ID-1: / size: 210.67 GiB used: 148.61 GiB (70.5%) fs: ext4 dev: /dev/dm-0 
Sensors:   System Temperatures: cpu: 54.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Info:      Processes: 211 Uptime: 11h 27m Memory: 3.73 GiB used: 1.35 GiB (36.3%) Init: systemd Compilers: 
           gcc: 8.2.1 Shell: bash v: 4.4.23 inxi: 3.0.28 

NAME                             FSTYPE      LABEL    UUID                                 FSAVAIL FSUSE% MOUNTPOINT
sda                                                                                                       
├─sda1                           vfat                 0CBD-B8C9                               299M     0% /boot/efi
├─sda2                           crypto_LUKS          ad8cb611-7c44-40a5-b670-6a6f6c2e2cb3                
│ └─luks-ad8cb611-7c44-40a5-b670-6a6f6c2e2cb3
│                                ext4                 ae9427fa-f3ac-4f25-b8a6-200734d6b1d9   51.3G    71% /
└─sda3                           crypto_LUKS          20247a76-7457-4de4-aef1-dd481864c979                
  └─luks-20247a76-7457-4de4-aef1-dd481864c979
                                 swap                 d2321ad9-ab79-480e-9004-9a9b778d89dd                

Is it possible to create a new 40gb partition and maintain my current OS?

Thanks in advance.

[dglt]

when you post terminal output, put ```(3 backticks) above and below it to format it properly, or you can hit the </> right above the text/post box (same bar as emoji's).
im not trying to be an arse, just trying help you help yourself here. its explained better here:

How to provide good information in your posts

When asking questions in the forum, it would be most helpful to all members if you provide some basic information. When you provide info from the terminal, usually from your logs, you have to format it so the content is easy to read. First copy and paste your text/terminal/code into the post Then select the text/code and click the post edit toolbar button </> . Another handy way is to use 3 backticks ` at the start and 3 more at the end of the text like this: ``` Paste text or code here …

[AgentS]

@pSBAy5nsWsWrE4B6

Is it possible to create a new 40gb partition and maintain my current OS?

Why do you think you couldn't?

[pSBAy5nsWsWrE4B6]

Well i've tried to reduce my current partition using gparted and it wont allow me to do just that.

[AgentS]

@pSBAy5nsWsWrE4B6

it wont allow me to do just that.

Did you try it from a Live media boot or from inside your installation (which is obviously impossible)?
You have LUKS+LVM setup. It may need more knowledge.
I will add some tags so someone may come and assist (I have no experience).

Maybe have a look here for general info
LVM LUKS related Tutorials

[pSBAy5nsWsWrE4B6]

Ininitally from inside the installation and then from a live USB of kde manjaro.

Thanks for the link, i will read through them.