The plymouth splash comes up using the text theme instead of using the high-resolution graphical splash. The answer is that your kernel has not brought up a framebuffer, so plymouth has no way to display the graphics. lspci output shows the following: 00:10.0 VGA compatible controller [0300]: NVIDIA Corporation C73 [GeForce 7100 / nForce 630i] [10de:07e1] (rev a2) (prog-if 00 [VGA controller]) Subsystem: Micro-Star International Co., Ltd. Device [1462:736b] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 10 Region 0: Memory at fd000000 (32-bit, non-prefetchable) [size=16M] Region 1: Memory at d0000000 (64-bit, prefetchable) [size=256M] Region 3: Memory at fc000000 (64-bit, non-prefetchable) [size=16M] Expansion ROM at fea40000 [disabled] [size=128K] Capabilities: <access denied> Kernel modules: nouveau, nvidiafb Neither the nouveau nor the nvidiafb driver is loaded, according to /proc/modules on your system. This explains why there's no framebuffer, but is very unusual. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/961349
You probably have nouveau blacklisted / disabled by nomodeset/modeset=0