Linux Mint solo me reconoce 1.4 de 4 de memoria ram

[seu230]

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 [Seleccionar] Expandir

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