1/ A non-encrypted Trisquel install worked without issues.
2/ An encrypted Trisquel drive got me an error at the end of the install:
"AHCI transfer timed out". It prevented from going further in the install.
The (accidentally found) solution was to remove the X200 from its Ultrabase.
3/ After the install, when turning the laptop on while on it's Ultrabase, the error message still appeared, yet did not prevent from booting.
The solution was (props to jxself in particular) to remove the DVD drive that was in the Ultrabase.
Now, here's the data obtained from the "sudo wodim -prcap" command:
Device was not specified. Trying to find an appropriate drive...
Detected CD-R drive: /dev/sr0
Using /dev/cdrom of unknown capabilities
Device type : Removable CD-ROM
Version : 5
Response Format: 2
Vendor_info : 'HL-DT-ST'
Identification : 'DVDRAM GU10N '
Revision : 'MX05'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Drive capabilities, per MMC-3 page 2A:
Does read CD-R media
Does write CD-R media
Does read CD-RW media
Does write CD-RW media
Does read DVD-ROM media
Does read DVD-R media
Does write DVD-R media
Does read DVD-RAM media
Does write DVD-RAM media
Does support test writing
Does read Mode 2 Form 1 blocks
Does read Mode 2 Form 2 blocks
Does read digital audio blocks
Does restart non-streamed digital audio reads accurately
Does support Buffer-Underrun-Free recording
Does read multi-session CDs
Does read fixed-packet CD media using Method 2
Does not read CD bar code
Does not read R-W subcode information
Does read raw P-W subcode data from lead in
Does return CD media catalog number
Does return CD ISRC information
Does support C2 error pointers
Does not deliver composite A/V data
Does play audio CDs
Number of volume control levels: 256
Does support individual volume control setting for each channel
Does support independent mute setting for each channel
Does not support digital output on port 1
Does not support digital output on port 2
Loading mechanism type: tray
Does support ejection of CD via START/STOP command
Does not lock media on power up via prevent jumper
Does allow media to be locked in the drive via PREVENT/ALLOW command
Is not currently in a media-locked state
Does not support changing side of disk
Does not have load-empty-slot-in-changer feature
Does not support Individual Disk Present feature
Maximum read speed: 4234 kB/s (CD 24x, DVD 3x)
Current read speed: 4234 kB/s (CD 24x, DVD 3x)
Maximum write speed: 4234 kB/s (CD 24x, DVD 3x)
Current write speed: 4234 kB/s (CD 24x, DVD 3x)
Rotational control selected: CLV/PCAV
Buffer size in KB: 1024
Copy management revision supported: 1
Number of supported write speeds: 4
Write speed # 0: 4234 kB/s CLV/PCAV (CD 24x, DVD 3x)
Write speed # 1: 2822 kB/s CLV/PCAV (CD 16x, DVD 2x)
Write speed # 2: 1764 kB/s CLV/PCAV (CD 10x, DVD 1x)
Write speed # 3: 706 kB/s CLV/PCAV (CD 4x, DVD 0x)
Supported CD-RW media types according to MMC-4 feature 0x37:
Does write multi speed CD-RW media
Does write high speed CD-RW media
Does write ultra high speed CD-RW media
Does not write ultra high speed+ CD-RW media