Ya hice algunas cosas, por ejemplo modifique las siguientes lineas del archivo /etc/default/grub de esta forma
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GRUB_CMDLINE_LINUX=""
[ . . . más abajo . . . ]
GRUB_GFXMODE=1360x768
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02: None 00.0: 11001 VESA Framebuffer
[Created at bios.459]
Unique ID: rdCR._oMLhpnq0pA
Hardware Class: framebuffer
Model: "NVIDIA GF106B Board - 10500000"
Vendor: "NVIDIA Corporation"
Device: "GF106B Board - 10500000"
SubVendor: "NVIDIA"
SubDevice:
Revision: "Chip Rev"
Memory Size: 14 MB
Memory Range: 0xd1000000-0xd1dfffff (rw)
Mode 0x0300: 640x400 (+640), 8 bits
Mode 0x0301: 640x480 (+640), 8 bits
Mode 0x0303: 800x600 (+800), 8 bits
Mode 0x0305: 1024x768 (+1024), 8 bits
Mode 0x0307: 1280x1024 (+1280), 8 bits
Mode 0x030e: 320x200 (+640), 16 bits
Mode 0x030f: 320x200 (+1280), 24 bits
Mode 0x0311: 640x480 (+1280), 16 bits
Mode 0x0312: 640x480 (+2560), 24 bits
Mode 0x0314: 800x600 (+1600), 16 bits
Mode 0x0315: 800x600 (+3200), 24 bits
Mode 0x0317: 1024x768 (+2048), 16 bits
Mode 0x0318: 1024x768 (+4096), 24 bits
Mode 0x031a: 1280x1024 (+2560), 16 bits
Mode 0x031b: 1280x1024 (+5120), 24 bits
Mode 0x0330: 320x200 (+320), 8 bits
Mode 0x0331: 320x400 (+320), 8 bits
Mode 0x0332: 320x400 (+640), 16 bits
Mode 0x0333: 320x400 (+1280), 24 bits
Mode 0x0334: 320x240 (+320), 8 bits
Mode 0x0335: 320x240 (+640), 16 bits
Mode 0x0336: 320x240 (+1280), 24 bits
Mode 0x033d: 640x400 (+1280), 16 bits
Mode 0x033e: 640x400 (+2560), 24 bits
Mode 0x0345: 1600x1200 (+1600), 8 bits
Mode 0x0346: 1600x1200 (+3200), 16 bits
Mode 0x034a: 1600x1200 (+6400), 24 bits
Config Status: cfg=new, avail=yes, need=no, active=unknown
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Graphics: Card: NVIDIA GF116 [GeForce GTX 550 Ti]
Display Server: X.Org 1.18.4 drivers: nvidia (unloaded: fbdev,vesa,nouveau)
Resolution: 1360x768@60.02hz
GLX Renderer: GeForce GTX 550 Ti/PCIe/SSE2
GLX Version: 4.5.0 NVIDIA 384.90