thought i'd make a tab not the best but here you go, work out a little on your own.

All Apologies single version

standard tuning or half step down, sounds good either way.

Intro/beginning riff 1 (F#5 chord will help here, see down at chorus for diagram)

e|---------------------------------------------------|
B|---------------------------------------------------|
G|---------------------------------------------------|
D|------------4--------------------------------------|
A|---------------------------------------------------|
E|----0----2-----------------------------------------|

i think theres some palm muting

riff 2 (similar to the first riff, F#5 chord will help again)

e|-------------0-------------------------------------|
B|-------------0-------------------------------------|
G|------------(0)------------------------------------|
D|---------------------------------------------------|
A|---------------------------------------------------|
E|----0---2(b)---------------------------------------|

theres an occasional bend, listen to the record for timing, also the g string it 
sometimes slipped in, again listen to the record.

riff 3 is similar to riff 2 but again slightly different
  this is the last one you hear, before the final chorus.
e|-------------------0-------------------------------|
B|-----------------0---------------------------------|
G|---------------0-----------------------------------|
D|---------------------------------------------------|
A|---------------------------------------------------|
E|----0----2(b)--------------------------------------|

Verse chords (she had a moist vagina, etc)

A5 (x022xx@1)             C5e|-------------| (x355xx@1)  |----------------|
B|-------------|   |----------------|
G|-------------|   |------5---------|
D|----7--------|   |------5---------|
A|----7--------|   |------3---------|
E|----5--------|   |----------------|

A5 (x022xx@1)     C5 (x355xx@1)     She had a moist Vagina

listen to the record for timing.

chorus
MARAJUANA!
      E5 (022xxx@1)     F#5e|------------------------------| (244xxx@1)B|------------------------------|
G|------------------------------|
D|----2---------4---------------|
A|----2---------4---------------|
E|----0---------2/14b-----------|

song structure
intro riff 1
riff 2
verse
riff 2
verse
riff 2
verse
chorus
verse
chorus
riff 2 (without the 1st 2nd or 3rd string being played)
verse
  riff 2
{ the riffs are 4 bars but the last riff is 2 bars of riff 2 and then 2 of 3
  riff 3
verse
chorus
urghhhhhhhhhhhhhh ending

the last riff part please listen to understand what i mean.

Easy, but i dont know the end i guess Cobain is just messy around if not do a F# scale.

i know it isnt 100% accurate but its close.

listen to record for timings and anything else you can add or change.
a cover doesnt have to be spot on with the original, improvise a little.