Linux Mint solo me reconoce 1.4 de 4 de memoria ram

Hola recien me aventure a poner linux mint en una laptop lenovo x140e la bios si me reconoce los 4gb de memoria ram pero no se porque linux mint solo me reconoce 1.4gb si en realidad tengo 4, tengo mi disco particionado y en una particion tambien tengo ubuntu y este tambien me detecta solo 1.4gb a que se puede deber? les paso informacion de mi sistema cuando uso linux mint
Código:
System:    Host: sebastian-ThinkPad-X140e Kernel: 5.3.0-46-generic x86_64 bits: 64 compiler: gcc v: 7.5.0 
           Desktop: Cinnamon 4.4.8 wm: muffin 4.4.2 dm: LightDM 1.26.0 Distro: Linux Mint 19.3 Tricia 
           base: Ubuntu 18.04 bionic 
Machine:   Type: Laptop System: LENOVO product: 20BLA00C00 v: ThinkPad X140e serial: <filter> Chassis: type: 10 
           serial: <filter> 
           Mobo: LENOVO model: 20BLA00C00 serial: <filter> UEFI: LENOVO v: GSET60WW (2.05 ) date: 04/25/2014 
Battery:   ID-1: BAT1 charge: 59.3 Wh condition: 62.8/62.6 Wh (100%) volts: 11.9/10.8 model: SANYO 45N1176 type: Li-ion 
           serial: <filter> status: Discharging 
CPU:       Topology: Dual Core model: AMD E1-2500 APU with Radeon HD Graphics bits: 64 type: MCP arch: Jaguar rev: 1 
           L2 cache: 1024 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 5589 
           Speed: 798 MHz min/max: 800/1400 MHz Core speeds (MHz): 1: 798 2: 798 
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] Kabini [Radeon HD 8240 / R3 Series] vendor: Lenovo driver: radeon 
           v: kernel bus ID: 00:01.0 chip ID: 1002:9838 
           Display: x11 server: X.Org 1.20.5 driver: ati,radeon unloaded: fbdev,modesetting,vesa resolution: 1366x768~60Hz 
           OpenGL: renderer: AMD KABINI (DRM 2.50.0 5.3.0-46-generic LLVM 9.0.0) v: 4.5 Mesa 19.2.8 direct render: Yes 
Audio:     Device-1: Advanced Micro Devices [AMD/ATI] Kabini HDMI/DP Audio vendor: Lenovo driver: snd_hda_intel v: kernel 
           bus ID: 00:01.1 chip ID: 1002:9840 
           Device-2: Advanced Micro Devices [AMD] FCH Azalia vendor: Lenovo driver: snd_hda_intel v: kernel bus ID: 00:14.2 
           chip ID: 1022:780d 
           Sound Server: ALSA v: k5.3.0-46-generic 
Network:   Device-1: Broadcom and subsidiaries BCM43142 802.11b/g/n vendor: Lenovo driver: wl v: kernel port: 4100 
           bus ID: 01:00.0 chip ID: 14e4:4365 
           IF: wlp1s0 state: up mac: <filter> 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo driver: r8169 v: kernel port: 2000 
           bus ID: 03:00.0 chip ID: 10ec:8168 
           IF: enp3s0 state: down mac: <filter> 
Drives:    Local Storage: total: 111.79 GiB used: 20.86 GiB (18.7%) 
           ID-1: /dev/sda vendor: A-Data model: SU650 size: 111.79 GiB speed: 6.0 Gb/s serial: <filter> rev: 831a scheme: GPT 
Partition: ID-1: / size: 49.71 GiB used: 20.86 GiB (42.0%) fs: ext4 dev: /dev/sda3 
Sensors:   System Temperatures: cpu: 54.0 C mobo: 0.0 C gpu: radeon temp: 55 C 
           Fan Speeds (RPM): cpu: 598 
Repos:     No active apt repos in: /etc/apt/sources.list 
           Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
           1: deb http://packages.linuxmint.com tricia main upstream import backport
           2: deb http://archive.ubuntu.com/ubuntu bionic main restricted universe multiverse
           3: deb http://archive.ubuntu.com/ubuntu bionic-updates main restricted universe multiverse
           4: deb http://archive.ubuntu.com/ubuntu bionic-backports main restricted universe multiverse
           5: deb http://security.ubuntu.com/ubuntu/ bionic-security main restricted universe multiverse
           6: deb http://archive.canonical.com/ubuntu/ bionic partner
           Active apt repos in: /etc/apt/sources.list.d/official-source-repositories.list 
           1: deb-src http://packages.linuxmint.com tricia main upstream import backport
           2: deb-src http://archive.ubuntu.com/ubuntu bionic main restricted universe multiverse
           3: deb-src http://archive.ubuntu.com/ubuntu bionic-updates main restricted universe multiverse
           4: deb-src http://archive.ubuntu.com/ubuntu bionic-backports main restricted universe multiverse
           5: deb-src http://security.ubuntu.com/ubuntu/ bionic-security main restricted universe multiverse
           6: deb-src http://archive.canonical.com/ubuntu/ bionic partner
           Active apt repos in: /etc/apt/sources.list.d/teamviewer.list 
           1: deb http://linux.teamviewer.com/deb stable main
           Active apt repos in: /etc/apt/sources.list.d/webupd8team-java-bionic.list 
           1: deb http://ppa.launchpad.net/webupd8team/java/ubuntu bionic main
           2: deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu bionic main
Info:      Processes: 180 Uptime: 17m Memory: 1.38 GiB used: 1001.5 MiB (71.0%) Init: systemd v: 237 runlevel: 5 Compilers: 
           gcc: 7.5.0 alt: 7 Shell: bash v: 4.4.20 running in: gnome-terminal inxi: 3.0.32