Your computer looks seriously unhappy:

[   83.854970] init: plymouth-stop pre-start process (2348) terminated with 
status 1
[ 5236.941792] show_signal_msg: 15 callbacks suppressed
[ 5236.941806] unity-2d-shell[2623]: segfault at 69006c ip b67f2ce5 sp bfdd5db0 
error 4 in libQtDeclarative.so.4.8.1[b65be000+376000]
[ 7349.477724] sr 1:0:1:0: [sr1] Unhandled sense code
[ 7349.477736] sr 1:0:1:0: [sr1]  
[ 7349.477740] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 7349.477743] sr 1:0:1:0: [sr1]  
[ 7349.477746] Sense Key : Medium Error [current] 
[ 7349.477751] Info fld=0x28f3d
[ 7349.477755] sr 1:0:1:0: [sr1]  
[ 7349.477759] Add. Sense: No seek complete
[ 7349.477763] sr 1:0:1:0: [sr1] CDB: 
[ 7349.477765] Read(10): 28 00 00 02 8f 3d 00 00 03 00
[ 7349.477777] end_request: I/O error, dev sr1, sector 670964
[52255.086965] Chrome_ChildThr[5485]: segfault at 0 ip b7752219 sp b0b729d0 
error 6 in libmozalloc.so[b7751000+2000]
[53842.683599] unity-2d-shell[13768]: segfault at 28 ip b6830ce5 sp bfc8fca0 
error 4 in libQtDeclarative.so.4.8.1[b65fc000+376000]

Between the segfaults and the IO errors, I suspect something is very
fundamentally wrong with your computer.

Good luck.

** Changed in: linux-lts-trusty (Ubuntu)
       Status: New => Invalid

** Information type changed from Private Security to Public

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https://bugs.launchpad.net/bugs/1404323

Title:
  missing/broken pkgs removed need to reinstall

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