I have the same problem after upgrading from 10.10 --> 11.04

Sensors-Detect says it detects it87 chip

Sensors-Detect:

mangrove@mangrove:~$ sudo sensors-detect
[sudo] password for mangrove: 
# sensors-detect revision 5861 (2010-09-21 17:21:05 +0200)
# System: FOXCONN M61PMV

This program will help you determine which kernel modules you need
to load to use lm_sensors most effectively. It is generally safe
and recommended to accept the default answers to all questions,
unless you know what you're doing.

Some south bridges, CPUs or memory controllers contain embedded sensors.
Do you want to scan for them? This is totally safe. (YES/no): YES
Module cpuid loaded successfully.
Silicon Integrated Systems SIS5595...                       No
VIA VT82C686 Integrated Sensors...                          No
VIA VT8231 Integrated Sensors...                            No
AMD K8 thermal sensors...                                   No
AMD Family 10h thermal sensors...                           Success!
    (driver `k10temp')
AMD Family 11h thermal sensors...                           No
Intel digital thermal sensor...                             No
Intel AMB FB-DIMM thermal sensor...                         No
VIA C7 thermal sensor...                                    No
VIA Nano thermal sensor...                                  No

Some Super I/O chips contain embedded sensors. We have to write to
standard I/O ports to probe them. This is usually safe.
Do you want to scan for Super I/O sensors? (YES/no): YES
Probing for Super-I/O at 0x2e/0x2f
Trying family `National Semiconductor'...                   No
Trying family `SMSC'...                                     No
Trying family `VIA/Winbond/Nuvoton/Fintek'...               No
Trying family `ITE'...                                      Yes
Found `ITE IT8716F Super IO Sensors'                        Success!
    (address 0x290, driver `it87')
Probing for Super-I/O at 0x4e/0x4f
Trying family `National Semiconductor'...                   No
Trying family `SMSC'...                                     No
Trying family `VIA/Winbond/Nuvoton/Fintek'...               No
Trying family `ITE'...                                      No

Some systems (mainly servers) implement IPMI, a set of common interfaces
through which system health data may be retrieved, amongst other things.
We first try to get the information from SMBIOS. If we don't find it
there, we have to read from arbitrary I/O ports to probe for such
interfaces. This is normally safe. Do you want to scan for IPMI
interfaces? (YES/no): YES
Probing for `IPMI BMC KCS' at 0xca0...                      No
Probing for `IPMI BMC SMIC' at 0xca8...                     No

Some hardware monitoring chips are accessible through the ISA I/O ports.
We have to write to arbitrary I/O ports to probe them. This is usually
safe though. Yes, you do have ISA I/O ports even if you do not have any
ISA slots! Do you want to scan the ISA I/O ports? (yes/NO): yes
Probing for `National Semiconductor LM78' at 0x290...       No
Probing for `National Semiconductor LM79' at 0x290...       No
Probing for `Winbond W83781D' at 0x290...                   No
Probing for `Winbond W83782D' at 0x290...                   No

Lastly, we can probe the I2C/SMBus adapters for connected hardware
monitoring devices. This is the most risky part, and while it works
reasonably well on most systems, it has been reported to cause trouble
on some systems.
Do you want to probe the I2C/SMBus adapters now? (YES/no): YES
Using driver `i2c-nforce2' for device 0000:00:01.1: nVidia Corporation nForce 
SMBus (MCP61)
Module i2c-dev loaded successfully.

Next adapter: SMBus nForce2 adapter at 1c00 (i2c-0)
Do you want to scan it? (yes/NO/selectively): yes
Client found at address 0x50
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 Yes
    (confidence 8, not a hardware monitoring chip)
Probing for `EDID EEPROM'...                                No
Client found at address 0x51
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 Yes
    (confidence 8, not a hardware monitoring chip)

Next adapter: SMBus nForce2 adapter at 1c40 (i2c-1)
Do you want to scan it? (yes/NO/selectively): yes
Client found at address 0x2f
Probing for `National Semiconductor LM78'...                No
Probing for `National Semiconductor LM79'...                No
Probing for `National Semiconductor LM80'...                No
Probing for `Analog Devices ADT7470'...                     No
Probing for `Winbond W83781D'...                            No
Probing for `Winbond W83782D'...                            No
Probing for `Winbond W83791D'...                            No
Probing for `Winbond W83792D'...                            No
Probing for `Winbond W83793R/G'...                          No
Probing for `Nuvoton W83795G/ADG'...                        No
Probing for `Winbond W83627HF'...                           No
Probing for `Winbond W83627EHF'...                          No
Probing for `Winbond W83627DHG/W83667HG/W83677HG'...        No
Probing for `Asus AS99127F (rev.1)'...                      No
Probing for `Asus AS99127F (rev.2)'...                      No
Probing for `Asus ASB100 Bach'...                           No
Probing for `Winbond W83L786NR/NG/R/G'...                   No
Probing for `Analog Devices ADM9240'...                     No
Probing for `Dallas Semiconductor DS1780'...                No
Probing for `National Semiconductor LM81'...                No
Probing for `Analog Devices ADM1029'...                     No
Probing for `ITE IT8712F'...                                No
Probing for `Fintek custom power control IC'...             No
Probing for `Winbond W83791SD'...                           No

Next adapter: bt878 #0 [sw] (i2c-2)
Do you want to scan it? (yes/NO/selectively): yes
Client found at address 0x50
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 No
Probing for `EDID EEPROM'...                                No
Client found at address 0x51
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 No
Client found at address 0x52
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 No
Client found at address 0x53
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 No

Next adapter: NVIDIA i2c adapter  (i2c-3)
Do you want to scan it? (YES/no/selectively): YES

Next adapter: NVIDIA i2c adapter  (i2c-4)
Do you want to scan it? (YES/no/selectively): YES
Client found at address 0x50
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 No
Probing for `EDID EEPROM'...                                Yes
    (confidence 8, not a hardware monitoring chip)

Next adapter: NVIDIA i2c adapter  (i2c-5)
Do you want to scan it? (YES/no/selectively): YES

Now follows a summary of the probes I have just done.
Just press ENTER to continue: 

Driver `it87':
  * ISA bus, address 0x290
    Chip `ITE IT8716F Super IO Sensors' (confidence: 9)

Driver `k10temp' (autoloaded):
  * Chip `AMD Family 10h thermal sensors' (confidence: 9)

To load everything that is needed, add this to /etc/modules:
#----cut here----
# Chip drivers
it87
#----cut here----
If you have some drivers built into your kernel, the list above will
contain too many modules. Skip the appropriate ones!

Do you want to add these lines automatically to /etc/modules? (yes/NO)NO

Unloading i2c-dev... OK
Unloading cpuid... OK


it87 is in /etc/modules as well as k8temp

lsmod doesn't show it87
lsmod:

mangrove@mangrove:~$ lsmod
Module                  Size  Used by
snd_hrtimer            12784  1 
binfmt_misc            17565  1 
xt_limit               12711  8 
xt_tcpudp              12603  15 
ipt_LOG                17016  8 
ipt_MASQUERADE         12759  0 
xt_DSCP                12629  0 
ipt_REJECT             12576  1 
nf_conntrack_irc       13383  0 
nf_conntrack_ftp       13359  0 
xt_state               12578  6 
nfsd                  316512  11 
lockd                  85732  1 nfsd
nfs_acl                12883  1 nfsd
auth_rpcgss            52881  1 nfsd
sunrpc                234297  12 nfsd,lockd,nfs_acl,auth_rpcgss
exportfs               12998  1 nfsd
iptable_nat            13182  0 
nf_nat                 25736  2 ipt_MASQUERADE,iptable_nat
nf_conntrack_ipv4      19640  9 iptable_nat,nf_nat
nf_conntrack           81956  7 
ipt_MASQUERADE,nf_conntrack_irc,nf_conntrack_ftp,xt_state,iptable_nat,nf_nat,nf_conntrack_ipv4
nf_defrag_ipv4         12729  1 nf_conntrack_ipv4
iptable_mangle         12734  0 
iptable_filter         12810  1 
ip_tables              27456  3 iptable_nat,iptable_mangle,iptable_filter
x_tables               29581  11 
xt_limit,xt_tcpudp,ipt_LOG,ipt_MASQUERADE,xt_DSCP,ipt_REJECT,xt_state,iptable_nat,iptable_mangle,iptable_filter,ip_tables
nvidia              10709116  40 
mt20xx                 17878  1 
tea5767                13298  0 
snd_hda_codec_via      62470  1 
tda9887                18263  1 
tda8290                22627  0 
ir_lirc_codec          12898  0 
snd_hda_intel          33211  2 
snd_hda_codec         103804  2 snd_hda_codec_via,snd_hda_intel
snd_hwdep              13604  1 snd_hda_codec
snd_bt87x              19128  1 
snd_seq_midi           13324  0 
lirc_dev               19232  1 ir_lirc_codec
snd_rawmidi            30486  1 snd_seq_midi
tuner                  27386  2 
snd_pcm                96625  3 snd_hda_intel,snd_hda_codec,snd_bt87x
snd_seq_midi_event     14899  1 snd_seq_midi
ir_sony_decoder        12549  0 
k8temp                 13016  0 
msp3400                36336  1 
snd_seq                61621  3 snd_seq_midi,snd_seq_midi_event
snd_timer              29602  3 snd_hrtimer,snd_pcm,snd_seq
snd_seq_device         14462  3 snd_seq_midi,snd_rawmidi,snd_seq
ir_jvc_decoder         12546  0 
bttv                  128715  0 
i2c_algo_bit           13400  1 bttv
v4l2_common            17647  3 tuner,msp3400,bttv
videodev               82052  4 tuner,msp3400,bttv,v4l2_common
hwmon_vid              12746  0 
ir_rc6_decoder         12546  0 
snd                    67382  17 
snd_hda_codec_via,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_bt87x,snd_rawmidi,snd_pcm,snd_seq,snd_timer,snd_seq_device
ppdev                  17113  0 
lp                     17825  0 
v4l2_compat_ioctl32    17078  1 videodev
ir_rc5_decoder         12546  0 
soundcore              12680  1 snd
videobuf_dma_sg        19307  1 bttv
snd_page_alloc         18529  3 snd_hda_intel,snd_bt87x,snd_pcm
parport_pc             36959  1 
videobuf_core          26135  2 bttv,videobuf_dma_sg
parport                46458  3 ppdev,lp,parport_pc
k10temp                13119  0 
ir_nec_decoder         12546  0 
btcx_risc              13640  1 bttv
rc_core                26918  7 
ir_lirc_codec,ir_sony_decoder,ir_jvc_decoder,bttv,ir_rc6_decoder,ir_rc5_decoder,ir_nec_decoder
tveeprom               21249  1 bttv
i2c_nforce2            13058  0 
psmouse                73535  0 
serio_raw              13166  0 
edac_core              53845  0 
edac_mce_amd           23464  0 
sata_nv                32054  3 
forcedeth              63555  0 
pata_amd               14130  0

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https://bugs.launchpad.net/bugs/751258

Title:
  Error updating sensor CPU

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