Instalei a versão do ubuntu 13.10, por duas vezes. Nas duas o computador não desligava (reiniciava quando era pra desligar), sendo necessário pressionar o botão. Além disso, foi ficando cada vez mais lento, travando e notificando problemas internos do sistema. Até que chegou um dia em que não ligava mais.
Agora instalei o lubuntu 14.04 e os problemas são os mesmos. Acho que o problema é com o sistema operacional.
Não quero deixar de usar o Linux, mas não sei o que fazer.
As informações do meu pc e do sistema operacional são:
Summary
Computer
Processor 2x AMD E-300 APU with Radeon(tm) HD Graphics
Memory 3637MB (911MB used)
Operating System Ubuntu 14.04 LTS
User Name pessoal (pessoal)
Date/Time Sex 01 Ago 2014 21:28:17 BRT
Display
Resolution 1366x768 pixels
OpenGL Renderer Unknown
X11 Vendor The X.Org Foundation
Multimedia
Audio Adapter HDA-Intel - HD-Audio Generic
Audio Adapter HDA-Intel - HD-Audio Generic
Input Devices
Power Button
Lid Switch
Power Button
AT Translated Set 2 keyboard
Video Bus
HP Wireless hotkeys
HP Truevision HD
SynPS/2 Synaptics TouchPad
HD-Audio Generic HDMI/DP,pcm 3=
HD-Audio Generic Headphone
HD-Audio Generic Mic
HP WMI hotkeys
Microsoft Microsoft Basic Optical Mouse v2.0
Printers
No printers found
SCSI Disks
ATA Hitachi HTS54503
hp DVDRAM GT80N
Operating System
Version
Kernel Linux 3.13.0-30-generic (x86_64)
Compiled #55-Ubuntu SMP Fri Jul 4 21:40:53 UTC 2014
C Library Unknown
Default C Compiler Unknown
Distribution Ubuntu 14.04 LTS
Current Session
Computer Name pessoal-HP-2000-Notebook-PC
User Name pessoal (pessoal)
Home Directory /home/pessoal
Desktop Environment LXDE (Lubuntu)
Misc
Uptime 21 hours, 46 minutes
Load Average 2,00, 0,00, 0,00
Kernel Modules
Loaded Modules
ctr CTR Counter block mode
ccm Counter with CBC MAC
dm_crypt device-mapper target for transparent encryption / decryption
joydev Joystick device interfaces
arc4 ARC4 Cipher Algorithm
snd_hda_codec_realtek Realtek HD-audio codec
hp_wmi HP laptop WMI hotkeys driver
sparse_keymap Generic support for sparse keymaps
rt2800pci Ralink RT2800 PCI & PCMCIA Wireless LAN driver.
snd_hda_codec_hdmi HDMI HD-audio codec
rt2800mmio rt2800 MMIO library
rt2800lib Ralink RT2800 library
rt2x00pci rt2x00 pci library
snd_hda_intel Intel HDA driver
rt2x00mmio rt2x00 mmio library
snd_hda_codec HDA codec core
snd_hwdep Hardware dependent layer
rt2x00lib rt2x00 library
snd_pcm Midlevel PCM code for ALSA.
mac80211 IEEE 802.11 subsystem
rfcomm Bluetooth RFCOMM ver 1.11
bnep Bluetooth BNEP ver 1.3
bluetooth Bluetooth Core ver 2.17
snd_page_alloc Memory allocator for ALSA system.
uvcvideo USB Video Class driver
videobuf2_vmalloc vmalloc memory handling routines for videobuf2
snd_seq_midi Advanced Linux Sound Architecture sequencer MIDI synth.
videobuf2_memops common memory handling routines for videobuf2
snd_seq_midi_event MIDI byte <-> sequencer event coder
kvm
videobuf2_core Driver helper framework for Video for Linux 2
snd_rawmidi Midlevel RawMidi code for ALSA.
videodev Device registrar for Video4Linux drivers v2
cfg80211 wireless configuration support
psmouse PS/2 mouse driver
rtsx_pci_ms Realtek PCI-E Memstick Card Host Driver
k10temp AMD Family 10h+ CPU core temperature monitor
serio_raw Raw serio driver
memstick Sony MemoryStick core driver
snd_seq Advanced Linux Sound Architecture sequencer.
eeprom_93cx6 EEPROM 93cx6 chip driver
crc_ccitt CRC-CCITT calculations
snd_seq_device ALSA sequencer device management
snd_timer ALSA timer interface
i2c_piix4 PIIX4 SMBus driver
snd Advanced Linux Sound Architecture driver for soundcards.
soundcore Core sound module
parport_pc PC-style parallel port driver
hp_wireless
ppdev
mac_hid
lp
parport
hid_generic HID generic driver
usbhid USB HID core driver
hid
rtsx_pci_sdmmc Realtek PCI-E SD/MMC Card Host Driver
radeon ATI Radeon
rtsx_pci Realtek PCI-E Card Reader Driver
i2c_algo_bit I2C-Bus bit-banging algorithm
r8169 RealTek RTL-8169 Gigabit Ethernet driver
ttm TTM memory manager subsystem (for DRM device)
mii MII hardware support library
drm_kms_helper DRM KMS helper
wmi ACPI-WMI Mapping Driver
ahci AHCI SATA low-level driver
drm DRM shared core routines
libahci Common AHCI SATA low-level routines
video ACPI Video Driver
Obrigado!