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Automounted USB devices are read only
March 6, 2018
Edited: June 12, 2020
September 20, 2023
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Problem appears to have gone away
This is a 5 y/o question on short term release Ubuntu 12.10. The
dmesg link is no longer available in the OP’s question. But if I plug in a Ubuntu 18.04 Live USB with persistent storage
$ dmesg | tail -n18 [115528.249547] usb-storage 1-9:1.0: USB Mass Storage device detected [115528.250152] scsi host2: usb-storage 1-9:1.0 [115528.250474] usbcore: registered new interface driver usb-storage [115528.255685] usbcore: registered new interface driver uas [115529.281407] scsi 2:0:0:0: Direct-Access Verbatim STORE N GO PMAP PQ: 0 ANSI: 6 [115529.282090] sd 2:0:0:0: Attached scsi generic sg1 type 0 [115529.992200] sd 2:0:0:0: [sdb] 30261248 512-byte logical blocks: (15.5 GB/14.4 GiB) [115529.992998] sd 2:0:0:0: [sdb] Write Protect is off [115529.993006] sd 2:0:0:0: [sdb] Mode Sense: 23 00 00 00 [115529.993787] sd 2:0:0:0: [sdb] No Caching mode page found [115529.993797] sd 2:0:0:0: [sdb] Assuming drive cache: write through [115530.592616] sdb: sdb1 sdb2 sdb3 sdb4 sdb5 [115530.596279] sd 2:0:0:0: [sdb] Attached SCSI removable disk [115531.018019] EXT4-fs (sdb5): warning: mounting unchecked fs, running e2fsck is recommended [115531.470201] EXT4-fs (sdb5): mounted filesystem without journal. Opts: (null) [115531.480738] ISO 9660 Extensions: Microsoft Joliet Level 3 [115531.483397] ISO 9660 Extensions: Microsoft Joliet Level 3 [115531.512219] ISO 9660 Extensions: RRIP_1991A
Unlike OP implies, there is no warning for read-only. Notice the line:
sd 2:0:0:0: [sdb] Write Protect is off
Apparently whatever the problem was 5 years ago, it no longer exists today under Ubuntu 16.04 LTS. Also for the only other LTS version today, 14.04 I can’t remember this being a problem either. Only SD RAM cards come to mind as being read only, which is a different problem altogether.